Answer:
a, c, t, g
Explanation:
uracil (u) is in place of t in rna
A researcher and students wants to study the effectiveness of a new cancer drug. To do this, they plan on injecting rats with cancerous cells and then administering the drug to half and administering a placebo to the other half. Their data will be stored electronically, and collaboration between the researcher and students will be done over e-mail. What are some of the ethical concerns regarding this study, and how can they remedy these issues?
The death of mice from cancer is an ethical issue, and the solution is to keep them alive through treatment.
One of the most serious ethical considerations would be the welfare of the rats used in the experiments. The rats could die after getting the malignant cells. If the new medicine fails to work, the animals may experience side effects before dying. This problem could be remedied by performing studies on tissue samples rather of animals.
The mice will die from cancer during this research, but it is vital for the growth of medical sciences and the discovery of medicines for the treatment of cancer and other severe diseases. The solution to this problem is to take specific steps to prevent the mice from dying while also conducting the research properly, allowing us to decide that the death of the mice during the experiment is an ethical concern.
Thus, The rats could die, which would raise ethical concerns.
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10 examples of biting and 10 example of piercing and chewing pests and how they affect crops
Examples of biting and chewing pests are snails, slugs, caterpillar, Helicoverpa, diamond black moth, beetles , termites, leaf worms, grass hoppers etc.
Examples of piercing insects are lace bugs, aphids, white flies, glassy winged sharp shooter, false chinch bugs, Bargrada bug, mealy bug, Eugenia psyllid, Pittosporum psyllid, Tipu psyllid etc.
Explanation:
Pests that affect crops have different feeding habits. Some pests belong to the type biting and chewing pests. These pests bite into the plant parts and chew them. This will leave circular holes in the leaves and semicircular holes in the leaf edges.
Piercing and sucking insects pierce into the plant parts and suck the sap. Removal of sap turns the plants yellow, and wilted. The growth might get stunted and in severe cases the plant may die off.
Chewing insects cause physical damage to plants by eating leaves, stems, and roots, leading to reduced photosynthesis and growth. Piercing-sucking insects damage crops by extracting plant sap and often transmit diseases to the plants.
Biting and Piercing-Chewing Pests and Their Effects on Crops
Chewing Insects:
Caterpillars (e.g., cabbage worms): Defoliate plants by eating leaves.Beetles (e.g., Colorado potato beetle): Damage foliage, stems, and roots.Grasshoppers: Consume leaves and young plants.Armyworms: Cause chewing damage to leaves and stems.Fall Webworms: Create webs and skeletonize leaves.Leafminers: Create tunnels in leaves, reducing photosynthesis.Root Weevils: Chew on roots, affecting plant stability and nutrient uptake.Cutworms: Cut off plant stems at the base.Weevils (general): Feed on various parts of plants.Earwigs: Chew on plant leaves and flowers.Piercing-Sucking Insects:
Aphids: Suck sap, causing deformed growth and transmitting diseases.Leafhoppers: Cause leaf curling and transmit pathogens.Scale insects: Weaken plants by continuous sap extraction.Mealybugs: Cause yellowing and stunted growth by sucking plant juices.Whiteflies: Excrete honeydew leading to mold growth on leaves.Squash bugs: Wilting and death of squash and pumpkin plants.Spider mites: Cause stippling and bronzing of plant leaves.Thrips: Deform flowers and leaves by sucking sap.Stink bugs: Damage fruits and vegetables by feeding and injecting toxins.Psyllids: Cause leaf yellowing and stunted growth by feeding on plant fluids.Both types of pests can seriously affect crop health and yield by directly damaging plant tissues or indirectly by transmitting diseases.
What are the major evolutionary trends that developed among major vertebrate groups?
Specifically, those that allowed for the transition from aquatic to terrestrial life.
Answer:
Many evolutionary changes resulted in the transition of aquatic vertebrates into terrestrial organisms. Some of these are:
Improved respirationIn terrestrial organisms, the respiratory system is more complex and enhanced than the aquatic vertebrates. For instance, the early amphibians had gills for respiration. But with the passage of time, lungs appeared which made life on land more feasible.
Body coveringsThe formation of rigid and insulated body coverings also was an adaptation that emerged for making life feasible on land.
Development of limbsLimbs allowed movement on land. With the passage of time, feet developed from the limbs.
Which of these most likely causes a total solar eclipse?
Select one:
a. the sun, moon at perigee, and Earth forming a triangle
b. the sun, moon at apogee, and Earth forming a triangle
c. the new moon at apogee coming between Earth and the sun along a straight line
d. the new moon at perigee coming between Earth and the sun along a straight line
Answer:
D. the new moon at perigee coming between Earth and the sun along a straight line
Explanation:
A new moon at perigee is significantly bigger than a new moon at apogee. Only a new moon at perigee is able to cover the sun's shine completely.
Have a good day! :)
Answer:
D
Explanation:
How are the number of chromosomes maintained during asexual reproduction?
Answer:
The number of chromosomes is maintained through the process of mitosis during asexual reproduction.
Mitosis can be described as a process in which a cell divides and produces two daughter cells which are exactly similar to the parent cell. The chromosome number of the daughter cells will be the same as the parent cells. No crossing over or recombination occurs during this type of cell division. Hence, mitosis is an effective way to maintain the chromosome number of organisms which reproduce asexually.
The no of chromosomes of a organism of each generation is maintained due to the meiosis.
Explanation:
The meosis is a kind of reductive division for the higher organisms and for the higher organism it is mitosis. The mitosis is the phase where the organism reproduce asexually, in this phase the two resulting daughter cells always contains the same no of chromosomes as the parent cell from which they derive.
The role of chromosomes is to maintain the each cell division is constant. It help us to enable us to grow and self maintenance of the body.
What is p53 and what does it do?
Answer
P53 is tumor antigen protein .
Explanation
This protein is isoform of tumor protein 53 and Trp53 . It is tumor suppressor protein .As it maintain conservation of genome by maintaining stability of genome. The gene p53 is mostly known as tumour suppressor gene . The 53 indicate the molecular weight of the protein which ix 53 kDa on SDS gel. It also activate DNA repair protein..
can you please tell me the answer
5 hours
Explanation:
Because it will
15 points plez help. Explain why an area that goes through secondary succession will likely reach its climax community before an area that goes through primary succession.
Answer:
Primary succession can be described as the development of a community in an area where there was no form of life before. For example, an area where volcanic eruption might have occurred.
Secondary succession can be described as an ecological succession which occurs in areas where the previous community had been destroyed by some kind of environmental disaster or human activity like fire etc.
As secondary succession occurs in areas where there was life before that means that the soil of this area will still have essential minerals and nutrients which will support life better as compared to areas of primary succession. In primary succession, the area might not even have soil. The rocks will be converted to soil in these area which will take a lot of time. Hence, an area that goes through secondary succession will likely reach its climax community before an area that goes through primary succession.
Answer:
The answer that they gave was
"An area going through secondary succession reaches its climax community faster because the area begins with some soil and some plant and animal species. An area that goes through primary succession, on the other hand, begins with no soil and no organisms, so reaching the climax community takes longer."
Explanation:
The one-celled eukaryotic organisms above are often found in freshwater ponds. What is one
characteristic they all have in common?
A Nucleus
B Cilia
C Flagellum
D Pseudopodia
Answer:
The correct option is A. Nucleus
Explanation:
The diagram in the question shows a paramecium, euglena and amoeba.
Paramecium can be describe as a fresh water animal which has a body covered with cilia. Flagellum and Pseudopodia lack in paramecium
Amoeba can be described as single celled organisms which have Pseudopodia for movement and shape changing.
Euglena is a single- celled organism capable of living is salt water as well as fresh water. It contains flagellum for movement but lacks cilia and Pseudopodia.
The structure common in all these organisms is the nucleus. Nucleus is present in every eukaryotic organism.
10 ml of a 3% hydrogen peroxide solution is added to five test tubes. As the hydrogen peroxide decomposes to produce oxygen gas, the rate of oxygen production is rated on a scale of 0 - 5, 0 meaning "no oxygen" and 5 meaning "fast".
Potential Catalyst Effects On Reaction Rate
Reactant -----Oxygen produced
H2O2------ 2
+0.1M FeCl3------ 5
+0.1M NaCl------- 0
+0.1M Fe(NO3)2----- 4
+0.1M KNO3---- 0
To the other four test tubes of hydrogen peroxide, five drops of additional solutions are added. The solutions are indicated in the data table as well as the rate of oxygen production for each.
Based on the data, what is the MOST appropriate conclusion for this experiment?
A) Iron compounds are always used as catalysts.
B) Reaction rate is always increased by iron compounds.
C) Increasing the temperature increases the rate of decomposition.
D) Iron compounds are a catalyst for the decomposition of hydrogen peroxide.
Answer:
D) Iron compounds are a catalyst for the decomposition of hydrogen peroxide.
Explanation:
The reaction of descomposition of hydrogen peroxide (H₂O₂) to produce oxygen (O₂) is:
2H₂O₂ → 2H₂O + O₂
Based on the data of potential catalys effects on reaction rate:
A) Iron compounds are always used as catalysts. FALSE. It is possible to know that, for this reaction, iron compounds are acting as catalyst but there is no information about all reactions to know that iron compounds are always catalysy
B) Reaction rate is always increased by iron compounds. FALSE. Again, for this reaction iron compounds increases reaction rate but it is not possible to know that reaction rate is always increased by iron compounds.
C) Increasing the temperature increases the rate of decomposition. FALSE. There is no information about temperature of reaction.
D) Iron compounds are a catalyst for the decomposition of hydrogen peroxide. TRUE. As both iron compounds increases the rate of reaction, it is possible to say that iron compounds are a catalyst for the descomposition of hydrogen peroxide.
I hope it helps!
Answer:
D
Explanation:
According to the experimental data, iron compounds are a catalyst for the decomposition of hydrogen peroxide. Both test tubes with H2O2 plus Fe(III) compounds show an increase in oxygen production, which in turn indicates an increase in the rate of reaction. There is no temperature variable in this experiment.
1. Which of the following is used by cells to store
and release the energy needed to power cellular
processes?
a. ATP
c. DNA
b. RNA
d. NADP+
Answer:
A
Explanation: ATP molecule stores energy chemically in the form of highly strained bonds.
ATP synthase: An important enzyme that provides energy for the cell to use through the synthesis of adenosine triphosphate (ATP). during chemical process
ATP is the molecule through which cells store and release energy for their various processes. It acts as the energy currency of the cell, with energy released upon its conversion to ADP. This energy is utilized by the cell for performing work and maintaining homeostasis.
Explanation:The molecule used by cells to store and release the energy needed to power cellular processes is Adenosine Triphosphate (ATP). ATP is often referred to as the 'energy currency' of the cell because it provides the energy for most of the energy-consuming activities within the cell. It functions as the energy currency by allowing cells to store energy briefly. The energy released by the hydrolysis of ATP can be used for cellular work, such as muscle contraction or driving endergonic chemical reactions by coupling them to ATP hydrolysis. When ATP is broken down into adenosine diphosphate (ADP) and a free phosphate group, energy is released. This energy is immediately available for cellular processes.
In the context of cellular respiration, ATP is the primary molecule that stores the energy released. During glycolysis, for example, the energy derived from glucose catabolism is used to recharge ADP into ATP. Comparatively, ATP stores smaller quantities of energy but in a form that is readily usable by cells, unlike molecules like glucose which store energy long-term but require conversion into ATP for immediate use.
Overall, ATP's role is critical in the function and regulation of many biochemical pathways, and it holds the energy that is required for vital cellular and bodily functions.
A scientific variable is something that Select in an experiment.
Select
changes
moves
remains
Answer:
A scientific variable is one that make changes in the experiment.
Explanation:
The things that are changing in an scientific experiment is called variables. Variables are something can make changes or effect the result of study. Variables are needed for every study in order to understand the differences. A variable is a condition or a factor that exist in different types or amount. There are three types of variable in a scientific experiment. Independent variable, dependent variable, and control variable. Independent variable is one that changes may occur and it is observed. Dependent variable is one that scientist should focus on observation to know how it respond to the changes on the independent variable.Control variable are quantities that should remain constant.What criteria should be used when evaluating competing solutions?
Answer:
Some idea of the value or merit of an idea (or a solution to a problem) can be discovered by the degree to which it fulfills some or all of the following criteria, as appropriate.
Explanation:
The solution achieves the stated goals, meets a need well.
"It works."
"That does it."
"Problem solved."
"That's perfect."
The criteria that should be used when evaluating competing solutions and the degree to which an idea (or problem-solving approach) is implemented can give us some insight into its worth or merit.
What is evaluating?A program, practice, intervention, or initiative can be studied scientifically through evaluation to determine how well it achieves its objectives. Evaluations assist in identifying the aspects of a program or initiative that are effective and could be improved.
English definition of evaluation is the act of evaluating or determining the standard, significance, quantity, or worth of something: It will be necessary to wait until all the data has been gathered before evaluating this new treatment.
Therefore, we can gain some understanding of an idea's worth or merit by considering the standards that should be applied when comparing competing solutions and the extent to which a problem-solving strategy is put into practice.
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example of omnivores
An omnivore eats both plants and animals!
Badgers, pandas, raccoons, and dogs are examples of omnivores I think!
Answer: human, raccoons, opossums, pigs, rats, badgers, and most bear species
Explanation:
put the following in order from smallest to largest: cells, tissues, organ systems, organs
1. Cells
2. Tissues
3. Organs
4. Organ Systems
Hope I helped!
~Stay golden~ :)
Answer:
Explanation:
1. Cells
2. Tissues
3. Organs
4. Organ Systems
The sequence of dna from your snork is found in which organelle?
Explanation:
The nucleus is a large membrane-bound organelle that houses the genetic information, DNA, in the cell.
Sequences of DNA make up genes which can have different forms called alleles. DNA is transcribed into mRNA and later translated into amino acids which are linked together by rRNA to form proteins.
Further Explanation:
All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. Chromosomes within the nucleus is unwound, unzipped and read by enzymes in a complex series of steps known as transcription. The message on DNA, called genes is copied by RNA polymerase, to form mRNA complementary sequence to that of the DNA strand. These are then translated into proteins in ribosomes.
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Why is science? Can you identify examples of science? Quick all you believe to be science.
Science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
Examples: anthropology, archaeology, astronomy, biology, botany, chemistry, cybernetics, geography, geology, mathematics, medicine, physics, physiology, psychology
Answer: geography
Explanation:
Which of the following statements is true?
Electrons have a negative charge.
The n=1 shell can hold eight electrons.
The number of electrons in an atom is equal to the number of neutrons.
The second electron shell can hold 16 electrons.
Explanation:
"Electrons have a negative charge." This is true. Electrons are found on the outside of the nucleus of an atom possessing a negative charge. "The n=1 shell can hold eight electrons." This is false. The n=1 can hold 2 electrons. "The number of electrons in an atom is equal to the number of neutrons." This is false. The number of electrons in a (neutral) atom is equal to the number of protons, not neutrons. "The second electron shell can hold 16 electrons." This is false. the number of electrons the electron shell can hold is 8 electrons.Glucokinase and hexokinase catalyze the first glycolysis reaction; glucokinase has a higher Km. Which is true? A. hexokinase is always functional and is not regulated by negative feedback B. they are not isozymes C. glucokinase is not a zymogen D. glucokinase becomes active from high levels of fructose
Answer:
The correct answer is C glucokinase is not a zymogen
Explanation:
zymogens are secreted as inactive enzyme which undergo activation by autocatalysis which deals with the removal of short peptide fragment from that zymogen resulting in the formation of active enzyme.
Foe example chymotrypsin enzyme is secreted as zymogens but not glucokinase.
Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and human activities.
Answer:
D . natural events and human activity
Very different looking anoles on the same Caribbean Islands that have similar DNA
sequences are evidence of:
a. Divergent evolution b . convergent evolution c. coevolution d. gradualism
Answer:
Similar DNA sequences would be indicative of a recent common ancestor hence the answer should be divergent evolution as the different appearances are evidence of divergence from a common ancestor.
It is unlikely to be convergent evolution as convergent evolution likely results in animals with similar appearances. Convolution would indicate similar modes of evolution between 2 different species that aided each other over time. While this is a product of gradualism, this is not evidence for gradualism directly.
Final answer:
Very different looking anoles with similar DNA sequences on the same Caribbean Islands are evidence of divergent evolution, where one species evolves into multiple distinct species with different adaptations.
Explanation:
Very different looking anoles on the same Caribbean Islands with similar DNA sequences are an example of divergent evolution. This process involves a single species evolving into multiple distinct species that adapt to different environments or niches. Anoles showing varied physical characteristics despite sharing similar DNA suggests that they have adapted to different conditions on the same island, a phenomenon that aligns well with the concept of adaptive radiation, where a single species gives rise to many, filling different ecological roles.
Divergent evolution is usually the result of one species spreading to different and isolated environments, leading to varied adaptations and characteristics due to genetic drift and natural selection. An example of divergent evolution on islands is also seen with Darwin's finches, where one ancestral species gave rise to multiple new species, each adapted to a distinct food source or niche.
Which of the following tags should be used to retrieve information from a
database about a DNA segment of a human gene that codes for a specific
protein?
A. Nucleotide sequence, human, hemoglobin
B. Sugar monomer, amino acid, fatty acid
O
C. Mouse, chromosome II, centrosome
O
D. Human, mouse, fruit fly
SUBMIT
Answer:
The correct option is A. Nucleotide sequence, human, hemoglobin
Explanation:
If the segment of the DNA for the human gene is known then it will be very easy to find the gene on a database. The tags which should be used will be the nucleotide sequence, where the known sequence shall be mentioned.
Then we will choose the tag for the organism which is humans in this case. Then we will select the tag for the protein which is made by the nucleotide sequence, which is protein in this case. Hence, option A is the correct answer.
how do you write 215500 in scientific
Answer:
215,500
Explanation:
i hope this helps
review the setup for photosynthesis select all primary limiting factors that impact the rate of photosynthesis for this lab setup
Answer:
The limiting factors are oxygen concentration, carbon dioxide concentration and light intensity
Explanation:
All the factors have to be in efficient amounts for photosynthesis to take place. If one is inefficient, the process will be affected; just like a three legged stool, if you remove one leg, the chair won't be able to stand.
Answer:
Option A, B and C are correct
Explanation:
The major limiting factors for this experimental setup would be –
1) Light intensity – Photosynthesis can occur even at a low intensity light but to achieve the maximum efficiency and output the intensity of light must be high. This is the reason why plants photosynthesize the maximum during the brightest time of the day.
2) Concentration of carbon dioxide – Higher the concentration of carbon dioxide, higher is the rate of photosynthesis. Plants take carbon dioxide from the atmosphere.
3) Oxygen – The oxygen concentration must be favorable for photosynthesis up to its optimum level. Beyond the optimum oxygen level, the photosynthesis process inhibits.
2. Mercury (II) oxide decomposes into mercury and oxygen gas according to the following
skeletal equation.
2 H90 → 2 Hg+ L02
a) How many moles of mercury (II) oxide are needed to produce 125 g of oxygen?
To produce 125 g of oxygen, 250 moles of mercury (II) oxide are needed.
Explanation:To determine the number of moles of mercury (II) oxide needed to produce 125 g of oxygen, we need to use the molar ratio between mercury (II) oxide and oxygen. From the balanced equation, we can see that 2 moles of mercury (II) oxide produce 1 mole of oxygen. Therefore, we set up a proportion:
(2 moles HgO) / (1 mole O2) = (x moles HgO) / (125 g O2)
Then, we cross multiply and solve for x:
x moles HgO = (2 moles HgO / 1 mole O2) * (125 g O2)
After calculation, we find that x is equal to 250 moles of mercury (II) oxide.
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To produce 125 g of oxygen (O₂), you need 7.8125 moles of mercury(II) oxide (HgO). This calculation is based on the balanced chemical equation and the molar mass of O₂. Hence, 7.8125 moles of HgO are required.
To determine how many moles of mercury(II) oxide (HgO) are needed to produce 125 g of oxygen (O₂), we use the balanced chemical equation:
2 HgO → 2 Hg + O₂
Here are the steps:
First, find the molar mass of O₂:
O: 16 g/molMolar mass of O₂ = 2 × 16 g/mol = 32 g/molNext, we calculate the moles of oxygen gas (O₂ )
Moles of O₂ = 125 g ÷ 32 g/mol = 3.90625 molesAccording to the balanced equation, 1 mole of O₂ is formed from 2 moles of HgO.
Thus, moles of HgO needed = 2 × moles of O₂:Moles of HgO needed = 2 × 3.90625 = 7.8125 molesTherefore, 7.8125 moles of mercury(II) oxide are needed to produce 125 g of oxygen.
18. If a cell needs to get waste out and nutrients in, this works best if
we reduce ______
and increase _____
Answer:
We reduce the size of the cell
and increase surface area to volume ratio.
Explanation:
help me with this plllllssss
Answer:
The correct option is D. The Linnaean System showed relationship between organisms based on observable characteristics.
Explanation:
Carolus Linnaeus is known as the father of taxonomy. Two main important contributions by Carlous Linnaeus were:
Classification based on hierarchyBinomial nomenclatureLinneaus Classification divided organisms into
KingdomClass.OrderGenusSpeciesThe method of binomial nomenclature uses the technique of naming organisms based on the genus and species name. This name is known as scientific name and it provides a unique name to each organism.
explain and give an example of and organism that can have 2 symbiosis relationships
Answer:
lichens
mycorrhiza
Explanation:
Lichens are formed by two types of organisms- an alga and fungus. The mycelium of the fungus forms athin mat which offers anchorage and protection to some microscopic algae. The alga provides the fungus with sugars which it produces through photosynthesis.
Mycorrhiza is a type of symbiotic relationship between a saprophytic fungus and vascular plants such as coniferous trees. The fungus develops in the soil near the base of the tree. Some of the hyphae penetrate into the outer layers into the soil from which it obtains mineral ions. It also decomposes proteins to their amino acids. The fungus shares these nutrients with its tree host.
Which biome is characterized by plants that drop their leaves in the winter? A. desert B. tropical rainforest C. taiga D. deciduous forest
Answer:
D. deciduous forest.
Explanation:
This biome is named for the dominant trees that drop their leaves during the winter months.
Look at this diagram of a plant.
Which label points to the feature of angiosperms that holds the developed seeds?
W
X
Y
Z
Answer:
W- developed seeds
X-angiosperm
Explanation:
Well for one, these two are the only things w/ a referrable image (I'm not sure if that's a word :-)) Another thing is angiosperm literally means flowering plant and a tomato is a ripe, or flowering, plant. W is an image of seeds that are at mid stage in there developing process, so it is clearly the answer. Correct me if im wrong :-D.