Answer:
ANSWER : NICHE
Explanation:
The particular role of a species or organism in its comprising ecosystem is termed as niche. Niche refers to every way that a specie interacts with its environment included both the biotic components as well as the abiotic components. Niche describes how well an organism is adapted for a particular environment. It tells us how well a species is for competing for food and other resources in that environment and how it is better for that environment.
A drug company is testing the effectiveness of a new blood pressure medicine using rats as the test subjects f) What is one factor that will be different between the experimental group and the control group?
Answer:
The factor that will be different between the experimental group and the control group is the independent variable.
Explanation:
Scientific experiments are conducted using control and/or experimental groups. The independent variable can be controlled and/or changed in an experiment so that the changes or effects it caused on the dependent variable can be tested. In an experimental group, the subjects are tested with the changes made in the independent variable; whereas, in a control group, the independent variable remains constant. Since the control group does not receive the independent test variable, the results of the experimental group are compared with that of the control group.
Consider the following events of photosynthesis. 1. Light energy excites electrons. 2. Water molecules are split. 3. NADPH is formed. In which locations do each of these events occur? 1. photosystem II 2. photosystem I 3. photosystem I 1. photosystem II 2. photosystem II 3. photosystem I 1. photosystem I 2. photosystem I 3. photosystem II 1. photosystem I 2. photosystem II 3. photosystem II
Answer: Option B. 1. photosystem II 2. photosystem II 3. photosystem I
Explanation:
Photosynthesis is the process by which plants make their own food in the presence of light utilizing carbon dioxide and water. this process occurs in chloroplast which contains green pigments called chlorophyll.
Photosystem are defined as the cluster of chlorophyll pigments found on the thylakoid membrane ( in chloroplast) which functions to collect energy and concentrate it to reaction center which further uses the energy to excite electrons and pass on to enzymes.
Photosystem II absorbs light and energy which allows the excitation of electrons and creates an electron deficiency in Photosystem II. the deficiency filled by Z protein which contain manganese that stimulates splitting of two water molecules.
NADPH formation takes place in Photosystem I. Photosystem I accepts energy from light which excites an electron and passed on to an electron acceptor called FeS. FeS then passes its e- to Ferrodoxin which donates its electron to NADP+ reductase. NADP+ reductase donates electron to NADP+ and add a proton to form NADPH to get stabilized.
Hence, the correct option is B.
Lima, Peru, is a city on the shore of the eastern Pacific. During a La Niña, you would expect the weather to be A. Warmer, drier than normal B. Warmer, wetter than normal C. Cooler, drier than normal D. Cooler, wetter than normal
Answer:
C. Cooler, drier than normal.
Explanation:
La Niña is a climate phenomenon, the colder counterpart of El Niño, that is characterized by the production or appearance of unusual colder temperatures in the regions of the Pacific Ocean, leading to the weakening of the maritime and continental anticyclones, which are areas of low cloudiness and atmospheric pressures that lessen the storms. It provokes
According to NASA, the atmosphere cools because of the low sea surface temperature and causes less water to evaporate. This results in a cooler, denser, and drier air in the region of Peru on the shore of the eastern Pacific Ocean.
Final answer:
During a La Niña event in Lima, Peru, the weather is cooler and drier than normal due to the cooling effects of the eastern Pacific Ocean and stronger trade winds.
Explanation:
In Lima, Peru, during a La Niña event, you would expect the weather to be cooler, drier than normal. La Niña is characterized by cooler than normal ocean temperatures in the eastern Pacific, particularly off the coast of Peru, which results from stronger trade winds. These conditions lead to reduced evaporation and less rainfall, making the coastal areas of Peru drier. In contrast, El Niño conditions, which involve warmer ocean temperatures, lead to wetter weather due to increased evaporation and rainfall. As such, a La Niña typically has the opposite effect, thus the correct answer to the student's question is C. Cooler, drier than normal.
One summer, floods covered low-lying garlic fields situated in a region with a large mosquito population. Since mosquitoes lay their eggs in standing water, flooded fields would normally attract mosquitoes, yet no mosquitoes were found in the fields. Diallyl sulfide, a major component of garlic, is known to repel several species of insects, including mosquitoes, so it is likely that diallyl sulfide from the garlic repelled the mosquitoes.
Which of the following, if true, most strengthens the argument?
(A) Diallyl sulfide is also found in onions but at concentrations lower than in garlic.
(B) The mosquito population of the region as a whole was significantly smaller during the year in which the flooding took place than it had been in previous years.
(C) By the end of the summer, most of the garlic plants in the flooded fields had been killed by waterborne fungi.
(D) Many insect species not repelled by diallyl sulfide were found in the flooded garlic fields throughout the summer.
(E) Mosquitoes are known to be susceptible to toxins in plants other than garlic, such as marigolds.
Answer:
(D) Many insect species not repelled by diallyl sulfide were found in the flooded garlic fields throughout the summer.
Explanation:
Mosquitoes were not found in the ideal breeding environment provided by the standing water in flooded fields. The fields were planted with garlic plants which are rich in diallyl sulfide and it is known to repel mosquitoes. Hence, mosquitoes were not able to propagate in the garlic fields.
A statement that can strengthen this argument is that insect species which are not repelled by diallyl sulfide were found in the flooded waters. If these insects were also not present then it could have been said that some other factor apart from diallyl sulfide was operating to halt their breeding. Other insect species were probably still present in fields because they are not repelled by diallyl sulfide.
Fenestrated capillaries ________.
A. are not common in endocrine organs and in areas where capillary absorption is an important function
B. are not more permeable than continuous capillaries
C. do not occur in the glomerular capillaries of the kidneys
D. are not found in the brain
Answer:
D. are not found in the brain
Explanation:
Capillaries are the smallest blood vessels. Their wall is made of a single layer of endothelial cells. Continuous capillaries have uninterrupted lining of endothelial cells. Only small molecules like water molecules and ions can pass through them. Fenestrated capillaries on the other hand have 60-80 nm diameter pores in endothelial cells. Some larger molecules like certain types of proteins can diffuse through them.
They are found in tissues which are engaged in extensive molecular exchange with blood like endocrine glands, kidney and small intestine because they are more permeable than continuous capillaries. They are not found in brain because molecular exchange needs to be highly regulated and restricted in brain. Brain has continuous capillaries which form the blood brain barrier.
You discover that the underlying cause of a disease is a protein that is now less stable than the non-disease-causing version of the protein. This change is most likely to be due to ________.
A. a mutation within a gene.
B. a mutation within the regulatory DNA of a gene.
C. gene duplication.
D. horizontal gene transfer.
Answer:
A. a mutation within a gene.
Explanation:
According to my research on studies conducted by geneticists, I can say that based on the information provided within the question that this change is most likely due to a mutation within a gene. Which is a permanent change in the DNA sequence that makes up a gene, causing it to be very different than the normal gene.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
What do glaciers deposit that helps scientists study ancient climates?
plants that produce pollen grains
rocks formed from lava
sediment that contains fossils
animals that migrate
Answer: C. Sediment that contains fossils
Explanation:
Answer:
Sediment that contains fossils are the glaciers deposit that helps scientists study ancient climates. Hence the answer is option C.
Explanation:
Glaciers are the big ice formed due to the cold weather in Arctic ocean and Antarctic ocean. These are the huge mass and very old in age. Some of them are 1000 years old. The animal which used to live at that time got trapped in The glacier and got preserved.
The body is a deposited in sediments. When the archaeologist search those glacier the sediments which contains fossils are found and they are helpful for determining the animals and their lifestyle which was extinct many years back.
Which sentences describe the discipline of the natural sciences? It includes different sciences, such as biology, chemistry, and earth sciences. With the help of toxicology, environmental scientists can study the toxic effects of chemicals on humans. Chemistry contributes to environmental science through the study of chemicals and chemical processes, such as pollutants and the chemical characteristics of the environment. Earth science helps in studying Earth, the oceans, and the atmosphere. In addition, epidemiology, which is another prominent scientific field, guides environmental scientists to study diseases that affect human health.
Answer:
Option A, It includes different sciences, such as biology, chemistry, and earth sciences
Explanation:
There are various disciplines and sub disciplines of science. These are as follows -
a) Majorly there are three disciplines or broad areas of study of natural science and these are-
Biology
Chemistry
Physics
b) These broad areas have some sub disciplines which include the following -
Biochemistry
Geophysics
Earth science
Astronomy
Behavioural science
Anthropology
Geology
Hence, option A is correct
The sentences that describe the discipline of the natural sciences are:
"It includes different sciences, such as biology, chemistry, and earth sciences.""With the help of toxicology, environmental scientists can study the toxic effects of chemicals on humans.""Chemistry contributes to environmental science through the study of chemicals and chemical processes, such as pollutants and the chemical characteristics of the environment.""Earth science helps in studying Earth, the oceans, and the atmosphere.""In addition, epidemiology, which is another prominent scientific field, guides environmental scientists to study diseases that affect human health."What are the natural sciencesThese sentences highlight different aspects of the natural sciences and their applications in understanding the environment, chemistry, Earth science, and epidemiology.
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Genetic adaptation
a. occurs at the individual level throughout an individual’s lifetime.
b. occurs at the population level via natural selection.
c. involves using material culture to make living possible in certain settings.
d. occurs at the individual level during childhood.
Answer:
b. occurs at the population level via natural selection
Explanation: Genetic adaptation can be described as the change or adjustment in structure or habits by which a species becomes better able to function in its environment, occurring through the course of evolution by means of natural selection.
An example of genetic adaptation at a population level is the encouragement of bipedalism in humans.
The degree of adaptation that can occur in a population is limited by the amount and kind of genetic variation in a population. If a population is suited to adapt and survie in its habitat it will undergo very little genetic adaptaction (prime example is the cockroach). If a population on the other hand is not able to adapt to its habitats´circumstances the popuation will undergo genetic variation in order to survive and ensure the continuation of the species. ( prime example are the birds Darwin studied in the Galapagos Islands)
Animals show anatomical adaptations—e.g., the body of the fish is suited to life in the water; the body of the bird is adapted for flight; and the land mammals show a wide variation in the structure of limbs and body that enables some to run swiftly, some to climb, some to swing from tree to tree, some to glide through the air, and others to jump.
A transition from a squirrel to a monkey is seen easily by a. the transition of paws to hands with finger nails and position of the thumb b. the transition to bipedalism c. the tranisition of tails because primates do not have tails d. none of the above
Answer:
The correct answer is b. the transition to bipedalism
Explanation:
Bipedalism is the type of movement or locomotion in which any animal use their two legs to move. A squirrel do not have ability to do transition to bipedalism but hominids like monkey have the ability to walk and run on two legs. So this transition from squirrel to a monkey can easily be seen.
Bipedalism allow monkeys to use their arms for different purpose like hanging on trees, making or using tools, fighting, using their hands to communicate each other and show their emotions. Reports shows that bipedalism require less energy for locomotion showing their advantage.
All the iron molecules that are in your body were originally created by
Answer:
A star/supernova
Explanation:
All the iron molecules that are in your body were originally created by a star. During a star supernova, a very large amount of energy and neutrons are released by stars which allows heavier elements to be produced
Answer:
a star That's correct!
Explanation:
Methanol poisoning occurs when the body converts a large amount of methanol to harmful chemicals that attack the optic nerves, leading to acute blindness. Ethanol is the antidote for methanol poisoning because ethanol is preferentially processed by the body. Ethanol is most likely to be a(n):A. allosteric inhibitor.B. competitive inhibitor.C. noncompetitive inhibitor.D. irreversible inhibitor.
Answer:
Ethanol is most likely to be a (B), competitive inhibitor.
Explanation:
The poisoing occurs because of the harmful metabolites produced by the alcohol dehydrogenases, enzymes in charge of breaking down alcohol.
Hence, the most likely strategy of an antidote is to compete for the active site of the enzyme and prevent the methanol convertion to harmful chemicals.
Ethanol does not produce these metabolites and it is preferentially proccessed by the body, so it is a competitive inhibitor, competing for the active site.
An echocardiogram reveals Charles, an ultramarathon runner, has an enlarged left ventricle. As this increase in ventricular size is supported by increased blood flow and ATP production due to the training Charles has undertaken, this increase in heart size demonstrates
Answer:
The correct answer would be - physiological hypertrophy.
Explanation:
Physiological hypertrophy of is a condition of the heart that occurs in return of the normal growth an individual such as an athlete like Charles who is a marathon runner in this case.
Left ventricle hypertrophy is a common type of hypertrophy that occurs in this condition in which the left ventricle of the heart increase in size temporary which arises in response to the exercise and function is done by muscles.
thus, the correct answer is - physiological hypertrophy.
QUESTION 3
HCl is the formula for _____.
A)the hydronium ion
B)hydrochloric acid
C)hydrogen peroxide
D)sodium hydroxide
Answer:
HCl is known as hydrochloric acid. Hence the answer is option B.
Explanation:
Hydrochloric acid is an example of strong acid. This can be completely dissociates into aqua solution. It is also the very common acid used in chemical reactions. It is formed by the fusion of hydrogen atom and chlorine atom. This is formed due to the single substitution of ions.
The molecule has lower value of PH which indicates it as a very strong acid. This add acid is also present in our stomach. This side also helps in proper digestion of food and preservation of the food inside the stomach and it also close all the bacteria which are harmful for the human body
A scientist wishes to test a new antibiotic's ability to treat stubborn bacterial infections. He tests his hypothesis that the antibiotic works better than existing treatments by giving bacterial infections to mice and treating them with the antibiotic. He then determines how many of the mice recover from their infections. What is missing from his experimental design? :a. He is missing a control group of mice that received a half dose of the new antibiotic.b. He is missing a control group of mice that did not receive the new antibiotic.c. Nothing is missing he has done everything he needs to do for this to be a successful experiment
Answer:
b. He is missing a control group of mice that did not receive the new antibiotic.
Explanation:
He only has data that the antibiotic works, but not that it is more effective than existing treatments.
The correct answer is B. He is missing a control group of mice that did not receive the new antibiotic.
Explanation:
To test a hypothesis effectively especially if the scientist is manipulating or introducing one variable it is necessary to use one control and one experimental group. This means, in the case presented as the scientist is giving antibiotics to test their effectiveness to treat bacterial infections, he needs to include an experiment group which are the mice that had bacterial infections and are treated with the antibiotic and a control group that are mice that do not receive the antibiotic as without this the scientists might not know the real effect of the antibiotics. This means, in this case, he is missing the control group (Option B).
Which sentence best describes the function of nucleic acids?
1.They store extra organic compounds.
2.They store energy for later use by the body.
3. They carry information for building and maintaining structures.
4.They provide energy to cells.
Terrance creates a study analyzing how broccoli consumption is related to long-term health outcomes. However, in his study, Terrance finds a zero association between eating broccoli and long-term health outcomes.True / False.
Answer:
False.
Research shows that broccoli contains vitamins C, A, B6, and E; it also contains folate and a wide range of natural compounds that contribute to the prevention of heart diseases, diabetes, and cancer, amongst others.
Explanation:
Numerous recent studies have shown that broccoli is one of the vegetables that contain a great range of nutrients that not only contribute to the prevention of the previously-mentioned diseases, but it also helps to protect bones and skin, a crucial necessity for adults, especially at an older age.
However, when performing a scientific experiment, researchers can get different results. This doesn't mean that they are wrong or that, in this case, broccoli doesn't provide any benefits. Terrance's results can be controversial but discussable.
As the majority of the research studies demonstrate beneficial effects of broccoli, he can investigate, explore, and discuss the reason behing his conclusions. For example, was this a randomized study? Were all the participants healthy or did they have diseases in which broccoli can't provide a benefit? Ages? etc.
Nonetheless, broccoli does provide health benefits that allow people to live a long, healthier life as long as the person takes care of herself/himself (eat healthy, exercise, etc) as it is not considered a drug/medicine.
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Crosses among heterozygotes give a 12:3:1 ratio. What type of gene interaction would account for these results?
Answer:
A. epistasis
Explanation:
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Crosses among heterozygotes give a 12:3:1 ratio. Epistasis is the type of gene interaction that would account for these results.
Final answer:
The gene interaction leading to color variations in summer squash is an example of dominant epistasis, where one gene's dominant allele masks the expression of another gene. Resulting from a cross of WwYy individuals, this interaction gives a phenotypic ratio of 12 white, 3 yellow, and 1 green squash.
Explanation:
The type of gene interaction that accounts for the color varieties in summer squash as a result of several interacting loci, namely the A and B loci, is known as epistasis. Specifically, this is an instance of a dominant epistatic interaction, where the presence of a dominant allele at one locus masks the expression of alleles at a second locus. If the W gene has at least one dominant allele (AA or Aa), the squash will be white, which masks the effects of the Y gene alleles. When the W gene is homozygous recessive (aa), the color of the squash is then determined by the Y gene. If the Y gene is homozygous dominant or heterozygous (BB or Bb), the squash will be yellow, while the homozygous recessive combination of both genes (aabb) will yield a green squash. A typical heterozygous cross of WwYy individuals would thus result in a phenotypic ratio of 12 white : 3 yellow : 1 green squash.
What do the four major groups of organic compounds all have in common?
A They all contain carbon.
B They all contain nitrogen.
C They all contain water.
D They all contain carbon dioxide.
Answer:
A. They all contain carbon.
Explanation:
CHO,CHO,CHON, CHONPcarbohydrates- Carbon,Hydrogen, Oxygen 1:2:1
Lipids- Carbon, Hydrogen, and Oxygen
Protein- Carbon, Hydrogen, Oxygen and nitrogen
Nucleic Acid- Carbon, Hydrogen, Oxygen, nitrogen, and phosphorous
All four major groups of organic compounds - carbohydrates, proteins, nucleic acids, and lipids - contain carbon.
Explanation:The four major groups of organic compounds, which are carbohydrates, proteins, nucleic acids, and lipids, all have one thing in common - they all contain carbon. This is because organic compounds are defined by their carbon-based structures. Carbon atoms are unique because they can form stable bonds with many elements, including themselves, which allows for the complex structures of organic compounds. Therefore, the answer is A - all major groups of organic compounds contain carbon.
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ason and Alex are biologically unrelated adolescents who were adopted as infants and raised together. For which of the following are Jason and Alex least likely to resemble each other any more than they resemble a genetically unrelated adolescent from another home in their neighborhood?
A) extraversion
B) religious beliefs
C) table manners
D) political attitudes
Answer:
The correct answer is A) extraversion
Explanation:
Extraversion if one trait out of five traits that makes a person's personality. Extrovert people are more talkative, cheerful, energetic and social. They love to talk and make friends. They also have more leadership quality that introvert people.
An extravert person has sub traits like friendliness, assertiveness, excitement-seeking, cheerfulness, activity level, and gregariousness.
So extraversion is related to personality and all the members in the home have different personality like some may be extravert and some are introvert (conservative in nature).
As Jason and Alex are raised together so their religious beliefs, table manners, and political attitudes might be the same but they both might not have the same personality and extraversion trait.
In 1861, Pasteur conducted his now-famous experiments using flasks with long necks bent into an S-shape. Imagine that you are a scientist working in Pasteur’s lab at this time. You decide to tip the flasks so that broth enters the long S-shaped neck. You then return the flask to its upright position. Predict the most likely outcome of tipping one of Pasteur’s S-necked flasks.
Microbes would grow in the broth because the tipping would introduce the oxygen necessary for microbial growth.
The broth would become contaminated with microbes because they were trapped in the neck.
Since the broth had been heated (effectively sterilizing it), no microbes would grow in the broth.
The broth would remain uncontaminated because no microbes could enter the long S-shaped neck of the flask.
Answer:
The broth would become contaminated with microbes because they were trapped in the neck.
Explanation:
When Pasteur heat the bottles, he made them sterilizing, and as the water was condensed in one part of the S neck, it will act as a sealing mouth, so in this way no microorganism could enter. But at the same time is open at the end, so in this way, the air with microorganism could enter, an pollute the water in the middle. The clue here is that this polluted water is not in contact with the broth. If the flask is tip, the broth and the water will be in touch, in this way it will pollute the broth and microbes will grow.
Tipping a Pasteur swan-necked flask would likely lead to contamination of the sterile broth as trapped microbes in the neck would be introduced to the broth, highlighting that microorganisms come from other microorganisms, not spontaneously.
Explanation:In 1861, Louis Pasteur conducted experiments with S-shaped flasks that refuted the spontaneous generation theory. If you were to tip one of Pasteur’s swan-necked flasks so that the sterile broth enters the long S-shaped neck and then returned the flask to its upright position, the most likely outcome would be that the broth would become contaminated with microbes because they were trapped in the neck. The bending of the flask's neck was designed to trap airborne microorganisms and prevent them from entering the flask. Thus, tipping it would allow those trapped microbes to access the broth.
Initially, Pasteur’s experimental design used the unique shape of the flask's neck to allow air but prevent microbes from reaching the broth. When the swan neck was intact, even with the access to air, the broth remained sterile for months. However, as soon as the swan neck was broken, the broth quickly became turbid due to microbial growth, showing that microorganisms do not arise spontaneously but come from other microorganisms.
It is stated by some evolutionary scientists today that small dinosaurs eventually developed wings from jumping out of trees and then passed this acquired skill on to their descendants. this theory is based on the ideas of biologist? a) Dalton b) Darwin c) Newton d) Pasteur e) Lamarck
Answer:
e) Lamarck
Explanation:
Lamarck stated that traits could be acquired due to the use or disuse of a certain structure, for example: if giraffes were trying to reach leaves this would cause their necks to elongate and the trait would pass onto the next generation in other words organisms could change by what organisms want or need. In the 1880s, the German biologist August Weismann disproved this theory.
Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____.a. natural selectionb. an adaptationc. a homologous structured. a vestigial trait
Answer:
a vestigial trait
Explanation:
Vestigial trait is a characteristic that is present in an organism but not used for the intended purpose. For example: vestigial organs. These structures are in their rudimentary form and almost degenerated because they are not required anymore by the organism.
Many crustaceans use their tails to swim and hence have functional fully formed tails. However crabs usually walk on ocean beds. Crabs that do swim have modified rear legs. Hence, there is no requirement of a functional tail in crabs making it a vestigial trait. As a result, the tail is reduced and curled under their shells.
The formation of a cell plate is beginning across the middle of a cell and nuclei are re-forming at opposite ends of the cell. What kind of cell is this?
a. a plant cell undergoing cytokinesis
b. an animal cell in metaphase
c. an animal cell in telophase
d. a plant cell in metaphase
e. an animal cell undergoing cytokinesis
Answer:
a. a plant cell undergoing cytokinesis
Explanation:
Cytokinesis is the process where the cytoplasm divides after mitosis to form two different daughter cells from the parent cell. Animal cell divides by just a cleavage formation. Plant cells have an additional step of formation of cell plate because they have cell wall.
At the end of anaphase and beginning of telophase when the two new daughter nuclei have just formed, cell plat formation begins. Secretory vesicles from golgi body come at equator of the dividing parent cell. These vesicles release all the materials required for cell wall formation. The materials start to form the cell plate which moves outwards till it reaches the division site of parent cell wall. Slowly cell wall arises from cell plate and cytokinesis occurs giving rise to new plant cells.
The cell described is a plant cell undergoing cytokinesis. Cytokinesis is the final step in the cell cycle, where the cell physically divides. The presence of a forming cell plate and reforming nuclei are indicative of this process.
Explanation:Plant Cell Undergoing CytokinesisThe description provided fits with a plant cell undergoing cytokinesis. Cytokinesis is the physical division of a cell at the end of the cell cycle. In the process, the cell forms a structure known as a cell plate across the middle. This cell plate eventually grows and fuses with the cell wall to form two separate cells.
In animal cells, this process looks different, since animal cells lack a cell wall. Instead of a cell plate, they form a cleavage furrow which pinches the cell into two. The fact that this question mentions the formation of a cell plate suggests that we're dealing with a plant cell.
That the nuclei are reforming also indicates that the cell is in the later stages of cell division, specifically telophase or cytokinesis. Therefore, the correct answer is (a. a plant cell undergoing cytokinesis).
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PLEASE HELP 99 points and brainly answer!! im also being timed!!!! PLEASE HURRY ONLY 33 minutes!!!!
A group of students conducts research on enzyme activity and collects the data shown in the graphs.
Which statement is supported by the evidence in the graphs?
A
The enzyme functions well at a temperature of 35°C and would be active at any pH value.
B
The enzyme's activity is greatest at pH 7 and would not be affected by a change in temperature.
C
The enzyme is very active at approximately 42°C and within a pH range of 2 to 6.
D
The enzyme works best in a pH range of 6 to 8 and at a temperature of approximately 37° C.
(see first pic)
----------------------------------------------------------------------------
The picture is a major macromolecule.
What best describes the function of this macromolecule?
A
It is broken down to provide usable chemical energy.
B
It stores and transmits genetic information.
C
It transports oxygen in the blood.
D
It helps plants retain water.
(see second pic)
-----------------------------------
Proteins are involved with many different functions inside of the cell. A student argues that because of this, proteins need to have a wide variety of structures.
Which of the following statements about proteins BEST supports the student’s argument?
A
Proteins are made up of individual units that form polypeptide chains.
B
Proteins can be made up of any combination of 20 different amino acids.
C
Proteins are composed of both essential and nonessential amino acids.
D
Proteins are synthesized from RNA sequences containing four bases.
----------------------------
The graph illustrates the activity level of three common digestive enzymes, across a range of pH values. Which enzyme is likely to
be the most active in the acidic environment of the stomach?
A
amylase
B
trypsin
C
pepsin
D
pepsin and trypsin
(see third pic)
Answer:
not sure about 2 but, 1 is D. and 3 is A., while 4 is D.
Explanation:
This response outlines general observations about enzyme activity, macromolecule function, protein structure, and digestive enzymes based on given options. Specific answers require the actual graphs and pictures. Key points include enzyme functioning at optimal temperatures and pH levels, functions of macromolecules determined by their structure, protein structures influenced by amino acid combinations, and pepsin being the most likely active enzyme in the stomach's acidic environment.
Explanation:Without the actual graphs and pictures, exact answers can't be provided. Nonetheless, I'll attempt to provide some general observations:
Enzymes are known to function optimally at specific temperatures and pH levels. Their activity can be represented in graphs, which would show peaks at these optimal points. If we assume option D to be true, it suggests that the enzyme has its maximum activity at a temperature of approximately 37° C and a pH range of 6 to 8.
Macromolecules have different functions based on their structure. In general, option A might point to carbohydrates, option B to nucleic acids, option C to proteins (specifically hemoglobin), and option D to a complex carbohydrate like cellulose. An accurate answer would require the actual image.
Proteins indeed have various structures necessary for their wide range of functions. Structures are determined by the different combinations of the 20 amino acids - which supports argument B.
Lastly, the stomach has an acidic environment with a low pH value. Pepsin, a digestive enzyme that works optimally at low pH, might be the most active in the stomach. Hence, the answer might be option C.
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Paul Templet describes the process of eutrophication in the Gulf of Mexico. According to Templet, which of the following initiates the process?
a. Phytoplankton feed on nutrients, which creates plankton blooms.
b. Decaying marine organisms consume dissolved oxygen in the water.
c. Farm run-off carrying nutrients from nitrogen fertilizer washes to the ocean.
d. Plankton blooms cause a decrease in dissolved oxygen in the water.
Answer:
Farm run-off carrying nutrients from nitrogen fertilizer washes to the ocean.
Explanation:
When any water body becomes heavily enriched with minerals and nutrients such that it induces excessive growth of algae on the water body then such a process is known as eutrophication. The Gulf of Mexico is facing the problem of eutrophication due to the farm practices that are contributing to the formation of a dead zone in the Gulf. Farm run-off that carries nitrogen fertilizers into the ocean contributes to the excess of nutrients into the water body and cause depletion of dissolved oxygen in the water body.QUESTION 2
To neutralize gastric juices in your stomach, antacids contain ____.
A)bases
B)H+ ions
C)hydronium ions
D)phenolphthalein
To neutralize gastric juices in your stomach, antacids contain bases.
So A is the answer.
Answer:
To neutralize gastric juices in your stomach, antacids contain bases. Is the answer is option A.
Explanation:
The presence of hydrochloric acid inside the stomach makes the food very acidic and sometimes it is also considered to be as acidity in stomach. It can utilize this acidity of the food bases are required from outside of the body. For this work antacids are the best option to be used.
In antacid there is a presence of base which is helpful for making the acidic food neutralize for the further process. Milk of magnesia is very common example of antacid.
An organism's genetic information is stored in polymers of which type of macromolecule?
A carbohydrate
B nucleic acid
C lipid
D protein
Answer:
B. Nucleic acid
Explanation:
DNA and RNA
3. Looking at some pond water under the microscope, you notice an unfamiliar rod-shaped cell about 200 mm long. Knowing that some exceptional bacteria can be asbig as this or even bigger, you wonder whether your cell is a bacterium or aeukaryote. How will you decide? If it is not a eukaryote, how will you discoverwhether it is a bacterium or an archaeon? [20]
Answer:
Bacteria usually have a cell wall (made of peptidoglycan or lipids) in addition to a cell membrane while eukaryotes only have a cell membrane. Eukaryotes have a nucleolus while prokaryotes do not. The two features can be easily used to differentiate the two even on a light microscope with the right staining technique.
Maternal nondisjunction, the failure of homologous chromosomes or sister chromatids to separate properly, is associated Down syndrome and other types of aneuploidy in humans. Maternal age is associated with nondisjunction, although no age effect is seen in males. How might these findings be explained with respect to gametogenesis?
Answer and explanation:
Gametogenesis is a process in which gametes are formed from germ cells through meiosis. The genetic content of germ cells will be reduced from diploid (2n) to haploid (n). This means that the normal number of chromosomes of the species will be reduced by half.
This process in men takes place in the testicles and its purpose is to produce sperm. In the case of women, it occurs in the ovaries and the result is the production of oocytes.
Gametogenesis is performed in two successive chromosomal and cytoplasmic divisions, which are called meiosis I and meiosis II. In meiosis I the homologous pairs are joined and then separated by the mitotic bone, distributed at the poles of the cell. Then, in meiosis II, the sister chromatids of each chromosome are going to separate and are distributed in the new cells. Between both meiosis there is no division of DNA, for this reason it is that the chromosomal number is divided in half. Both meiosis include prophase, metaphase, anaphase and telophase.
As the failure to properly separate homologous chromosomes or sister chromatids is associated with Down syndrome, we can infer that it has to do with failures that occur in meiosis that will give rise to gametes.
An important difference is that gametogenesis in men occurs throughout life so they will always have "new" spermatozoa, instead, in women the gametes begin their meiosis during the prenatal stage, the oocytes will remain at rest and continue the process in each menstrual cycle from puberty (a group of oocytes is activated in each cycle and meiosis continues, being able to be fertilized or not). That is, women are born with all the oocytes they will have during their entire life. Thus, as the cycles pass the oocytes will be increasingly old and will have more risks of suffering problems during the separation of chromosomes in meiosis.