Answer:
A, they have variations in arrangement around a double bond.
Explanation:
If you look up a picture of cis trans isomers, you can see that both the cis and the trans isomer has a double bond. However, the other elements have a different arrangement. They are not mirror images, that would be enantiomers.
Hope this helps!
Cis-trans isomers are a type of stereoisomers which have the same molecular formula but different spatial arrangements due to a restricted rotation around a double bond. The correct description among the given choices is A) - they have variations in arrangement around a double bond. Other choices B), C), D), and E) refer to enantiomers, general chemical properties of isomers, structural isomers, and common feature of isomers respectively, not specifically cis-trans isomers.
Explanation:Cis-trans isomers are a type of stereoisomers where the atoms have different arrangements due to the restricted rotation around a double bond. The most accurate statement that describes cis-trans isomers among the choices provided is A) They have variations in arrangement around a double bond. While they share the same molecular formula, the spatial arrangement of these atoms is what distinguishes one from the other.
Here is a simple example: Let us consider a compound with formula C2H2Cl2. It may exist as either the cis-isomer or the trans-isomer. In the cis-isomer, the two chlorine (Cl) atoms are on the same side of the carbon (C) double bond, while in the trans-isomer, the Cl atoms are on opposite sides of the double bond.
Regarding the other choices, B) is incorrect as that describes enantiomers, D) is incorrect as isomers have the same molecular formulas but different spatial arrangements, C) is partly untrue as they do have some similar chemical properties due to having the same functional groups, but may behave differently due to different polarities, and E) is also incorrect as this describes structural isomers, not cis-trans isomers.
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How does deforestation affect the water cycle
Answer:
Explanation:
Deforestation is a precursor to desertification. A desert is an extremely arid region with little to no rainfall. How does this happen?
Plants contributes a significant proportion of water to the water cycle. During transpiration, water evaporates from the body parts of a plant and this water goes to the atmosphere. The water cools and condenses to form precipitation
When forests are removed, this significant proportion of the water cycle is lost. The water from plants would no longer be available for precipitation. Such an area will suffer drastic changes in the amount of precipitation it receives.
Answer:
It increases the amount of runoff
Explanation:
Protein synthesis in bacterial cells usually starts with a: a. cysteine residue. b. phenylalanine residue. c. formylmethionine residue. d. valine residue. e. methionine residue.
Answer:
c. formylmethionine residue
Explanation:
The initiation codon (5' AUG 3') is present in the P site of the bacterial ribosomes and bind to the tRNA carrying formyl methionine amino acid. The formyl methionine amino acid serves to initiate the process of protein synthesis in bacteria. The initiator amino acid formyl methionine is encoded by genetic code "AUG".
The direct answer is: c. formylmethionine residue.
In bacterial cells, protein synthesis typically begins with a formylmethionine residue.
Formyl methionine, also known as fMet or fMet-tRNA, serves as the initiator amino acid during translation in bacteria. This modified form of methionine contains a formyl group attached to the amino group, making it distinct from regular methionine. The presence of formyl methionine at the beginning of a protein chain allows the ribosome to recognize the start codon and initiate translation. Once the protein synthesis process begins, subsequent amino acids are added to the growing polypeptide chain. However, it's important to note that in some bacteria, particularly mitochondria, the initiation amino acid can be methionine instead of formyl methionine.
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Which of the following is a function of a signal peptide?
A) To bind RNA polymerase to DNA and initiate transcription
B) To direct mRNA molecules into the cisternal space of the ER
C) To terminate translation of the messenger RNA
D) To translocate polypeptides across the ER membrane
Answer:
D) To translocate polypeptides across the ER membrane is a correct answer.
Explanation:
The signal peptide is a short stretch of amino acids, present at N terminus of nascent protein.
Function of a signal peptide is to guide the protein where to go and is to transport the protein to the ER membrane.
When the protein is reserved for the secretion, then signal peptide guide the protein to translocate polypeptides across the Endoplasmic membrane, where it get mature and prepare for the secretion.
Thus option(D)To translocate polypeptides across the ER membrane is correct answer.
A signal peptide's function is to direct the translocation of polypeptides across the ER membrane by interacting with the SRP and the ER docking complex.
The correct function of a signal peptide is to direct the translocation of polypeptides across the endoplasmic reticulum (ER) membrane. As a nascent polypeptide is being synthesized by a ribosome, the signal sequence at the N-terminus of the polypeptide emerges first and is recognized by a signal recognition particle (SRP). This interaction leads to a pause in translation and facilitates the docking of the ribosome to the ER membrane. Once docked, translation resumes, and the polypeptide is translocated into the ER lumen through a protein pore.
NEED HELP TIMED TEST WILL GIVE BRAINLIEST
Lara spends her days cultivating new hybrid plants that she sells to Jon. Jon uses these plants to feed cattle because the hybrid plants offer better sources of nutrients.
Which most likely explains the jobs of Lara and Jon?
Lara works as a Nursery Manager and Jon works as a Grader.
Lara works as a Plant Scientist and Jon works as a Farmworker.
Lara works as a Forester and Jon works as a Farm Management Adviser.
Lara works as a Landscaper and Jon works as an Environmental Engineer.
Answer:
Lara works as a Plant Scientist and Jon works as a Farmworker.- second choice
Answer:Explained
Explanation:
Lara works as Plant scientist and Jon works as a farm worker as it is given in
question that Lara spends her days cultivating new hybrid plants and a plant scientist do the same job as specified , trying to find a hybrid plant which has
improved qualities than the parent plants.
While Jon has nothing to do with hybrid plant as he only needs rich nutrient fodder.
An atom that undergoes radioactive decay and has a large nucleus most likely contains
Answer:
An atom that undergoes radioactive decay and has a large nucleus most likely contains a high neutron-proton ratio.
here is the full questiojn below.
An atom that undergoes radioactive decay and has a large nucleus most likely contains:
(a) a high neutron-proton ratio.
(b) a low neutron-proton ratio.
(c) more protons than electrons.
(d) more electrons than protons.
Answer:
(a) a high neutron-proton ratio
Explanation:
An atom that undergoes radioactive decay and has a large nucleus most likely contains a high neutron-proton ratio. This stance is true because, the neutron–proton ratio of an atomic nucleus is the ratio of its number of neutrons to its number of protons. Among stable nuclei and naturally occurring nuclei, this ratio generally increases with increasing atomic number. This is because electrical repulsive forces between protons scale with distance differently than strong nuclear force attractions. As such, an atom that requires to undergo radioactivity and has large nucleic will most likely contains a high neutron-proton ratio.
Isotopes are atoms with the same atomic number i.e (the same number of protons) but different mass number (i.e number of neutrons). Isotopes are named according to their mass numbers; example chlorine-35, and chlorine-37. Their atomic numbers remain as 17 but neutron numbers differ (35 and 37).
Mitochondria and chloroplasts, organelles inside of eukaryotic cells, have their own membranes and genetic material. This is evidence of A. The endosymbiotic theory. B. Abiogenesis. C. Coevolution. D. Horizontal gene transfer.
Answer: The answer is A
Explanation:...Where the endosymbiotic theory deals with bacterial characteristics and the development of the mitochondria and chloroplast in eukaryote cells.
Which of the following describes the chromosomes in a fertilized egg?
A. Only from the mother
B. Only from the father
C. The diploid number
D. The haploid number
A fertilized egg contains the diploid number of chromosomes, which includes one set from the mother and one from the father, totaling 46 chromosomes in humans.
Explanation:The chromosomes in a fertilized egg are diploid, which means they contain two sets of chromosomes, one set from each parent. In humans, this amounts to a total of 46 chromosomes, with 23 being maternally derived (from the mother's egg) and 23 paternally derived (from the father's sperm). Therefore, the answer to the question would be C. The diploid number. Haploid cells, like the sperm and egg, have only half the number of chromosomes, which combine to form a diploid cell during fertilization. This cellular fusion results in a zygote, the initial cell of a new organism that contains a full set of chromosomes.
Use the model to explain how celiac disease interrupts the normal transportation of energy and other nutrients from the digestive system to the circulatory system.
Answer:
According to the model, the "villi" of small intestines is being damaged as an impact of celiac disease. Small intestines are responsible for absorption of nutrients and minerals from food, this occurs through villi, in case of damaged villi absorption is interfered, thus disturbing the digestive system. If the nutrients, minerals or vitamins are not being absorbed well by small intestines then they will be excreted out of the body and will not be transported to the blood and other areas, this would result in deficiency of minerals and vitamins in blood that cause weakness.
Answer: Plato Answer
The fingerlike shape of the villi is very important for nutrient absorption because it increases the surface area of the small intestine. In celiac disease, the villi flatten, decreasing the surface area of the small intestine. As a result, fewer nutrients get absorbed. Also, the model shows that celiac disease damages the epithelial cells of villi. The epithelial cell layer is important for the diffusion of nutrients to the capillaries. Without a healthy epithelial cell later, fewer nutrients may be absorbed, and the body may not have enough energy to perform its functions.
Guppies living in a stream have a variety of spot patterns, some of which provide good camouflage against the stones in the streambed and others of which make them stand out against the background, allowing potential mates to see them more easily. If a predator that hunted by sight were introduced to the stream, what would be the most likely long-term consequence for the guppy population?
A The number of guppies in the population would decline, although most of the remaining ones would be uncamouflaged.
B The guppy population would devise a mutation that allowed the camouflaged guppies to find mates by scent or sound.
C The guppy population would die out since none of the guppies would be able to find mates.
D The number of camouflaged guppies in the population would increase while the number of successful matings decreased.
Answer:
A The number of guppies in the population would decline, although most of the remaining ones would be uncamouflaged.
Explanation:
The number of guppies in the population would decline, although most of the remaining ones would be uncamouflaged would be the most likely long-term consequence for the guppy population.
Answer:
D. The number of camouflaged guppies in the population would increase while the number of successful matings decreased.
Explanation:
The predator would eat the uncamouflaged guppies, reducing the number of uncamouflaged guppies. At the same time, the number of camoflouged guppies would increase as a large percentage of the camouflaged guppies that would have mates with the uncamouflaged will instead have offspring with the camouflaged guppies. While the number of camouflaged guppies mating will increase, the total number of successful matings will decrease because a large percent of all matings were with uncamouflaged guppies and now that is being severely cut down since the predator is eating all of them.
Assume a population of purple and white flower pea plants (2000 total plants) is in Hardy-Weinberg equilibrium. The frequency of white flower plants is 0.16. On the basis of this information, determine the following:
a. The frequency (decimal form) of heterozygous purple plants. Round to 2 significant digits.
b. The frequency (decimal form) of the dominant allele (1 significant digit).
c. The number of homozygous purple flower plants.
I tried to take 2pg = 2(0.84)(0.16) for part A and got 0.268 (approximately 0.27) for the heterozygous purple flower but that was incorrect.4
Answer:
a) [tex]0.48[/tex]
b)
[tex]p= 0.4\\q=0.6[/tex]
c) [tex]720[/tex]
Explanation:
Given ,
Frequency of white flower plant ([tex]p^2[/tex]) is [tex]0.16[/tex]
Thus, frequency of dominant white allele ([tex]p[/tex]) is equal to [tex]\sqrt{0.16} \\= 0.4[/tex]
As we that, as per Hardy-Weinberg equilibrium equation
[tex]p+q=1[/tex]
Substituting the value of [tex]p[/tex] in above equation, we get
[tex]0.4+q=1\\q=1-0.4\\q=0.6[/tex]
a) As per Hardy-Weinberg equilibrium equation
[tex]p^2+q^2+2pq=1\\[/tex]
Substituting the given and calculated values in above equation, we get -
[tex]0.4^2+0.6^2+2pq=1\\0.16+0.36+2pq=1\\2pq=1-0.16-0.36\\2pq=0.48[/tex]
b) The frequency (decimal form) of the dominant allele
[tex]p= 0.4\\q=0.6[/tex]
c) number of homozygous purple flower plants
[tex]=[/tex] frequency of purple flower plants ([tex]q^2[/tex]) [tex]*[/tex] Number of flowers
[tex]= q^2 * 2000\\= (0.6^2)*2000\\= 0.36 * 2000\\= 720[/tex]
The light reactions of photosynthesis use chemiosmosis to produce ATP that will be used in the Calvin cycle. The electrochemical gradient that drives this chemiosmosis is formed across which structure(s)?
Answer: Thylakoid membrane.
Explanation:
Photosynthesis is a chemical process carried out by plants, algae, and certain microorganisms, whereby solar energy is captured and converted into chemical energy in the form of ATP and organic compounds. During electron transfer, the protons (H +) of the H atoms are sent to the interior of the thylakoids through their membranes, producing an energy gradient. This electrochemical gradient generates enough energy to phosphorylate ADP and produce ATP, similar to the oxidative phosphorylation that occurs in mitochondria. The end products are ATP and NADPH.
Cardiovascular effects of the sympathetic division include all of the following EXCEPT ________. a. weak dilation of the blood vessels of skeletal muscles during exercise b. constriction of most blood vessels c. increase of heart rate and force d. dilation of the blood vessels serving the skin and digestive viscera
Answer:
d. dilation of the blood vessels serving the skin and digestive viscera.
Explanation:
Cardiovascular effects of the sympathetic division include all of the following EXCEPT dilation of the blood vessels serving the skin and digestive viscera.
The sympathetic division of the nervous system involves increasing heart rate, constricting most blood vessels, and dilating blood vessels serving skeletal muscles. It does not include the dilation of blood vessels serving the skin and digestive viscera, which belongs to the parasympathetic division.
Explanation:The cardiovascular effects of the sympathetic division of the nervous system, part of the body's fight or flight response, include several responses geared towards preparing the body for immediate action. These effects include an increase in heart rate and force, constriction of most blood vessels, and the dilation of blood vessels serving skeletal muscles- to improve oxygen supply during exercise. However, the sympathetic division does not include the dilation of the blood vessels serving the skin and digestive viscera. This option is part of the parasympathetic division, which occurs when the body is in a state of rest and digestion.
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Keratin is an intracellular protein. How is it made?
Answer: Formed by intermediate filaments
Explanation:
Keratin belongs to the family of fibrous structural proteins. It is found in abundant amount inside the human body.
Hair constitutes of about 90% of keratin protein. The epidermis is the outer layer of skin which is formed by scale like cells known as epithelial cells and specialized cells known as keratinocytes.
These cells protect the body from the outer damage and is formed by long strands of proteins(intermediate filament) inside the cell, hence called keratin.
This is how keratin is made inside the body.
An in vitro experiment involves making observations of events in a
A. test tube
B. growth chamber
c. living organism
D. total vacuum
Answer:
A; test tube
Explanation:
In-vitro is defined as a technique of performing a given procedure in a controlled environment outside of a living organism. It does not correspond to the circumstances you would usually see in a living organism (since it is most likely in a test tube). This means that an in-vitro experiment could not be applied in a growth chamber in which outside/environmental factors affect the whole organism. You can also eliminate C since in vitro is exclusively taken place outside of a living organism. For D, you most likely wouldn't be able to observe much in a total vacuum as organisms work under regular Earth atmospheric conditions and a total vacuum would not accommodate that as it has a lower pressure.
According to the cladogram shown, which two animal species shared the most recent common ancestor?
A. Primates and crocodiles
B. Birds and rodents
C. Sharks and birds
D. Birds and crocodiles
Answer:
Birds and Crocodiles (Ans. D)
Explanation:
Birds and Crocodiles shows most recent common ancestor because they are part of much larger group known as Archosauria (ruling lizards). When they both species divided from each others, they divided into 2 major evolutionary pathways:
The bird-line archosours , and the second one is crocodile-line archosours (which includes crocodilians and their ancestors).
So, Crocodiles are the closest living relatives of the birds and they sharing the most common ancestor.
Which of the functions listed below is/are attributed to various plasma proteins? 1. contribute to blood clotting 2. exert colloid osmotic pressure (to assist the maintenance of water balance) 3. help attack viruses and bacteria 4. function as transport proteins for several steroid hormones 5. transport fat-soluble vitamins 6. transport oxygen
Answer:
The correct answers are options 1, 2, 3, 4 and 5.
Explanation:
Plasma proteins are the proteins found in blood plasma and exhibit distinct functions, like the conduction of various biochemicals in the circulatory system, maintaining the balance of fluid and levels of electrolyte in the body, regulating osmotic pressure, and others.
Some of the more general plasma proteins found in the plasma of the blood are serum albumin, which helps in maintaining the osmotic pressure and transporting biomolecules around the body. Fibrinogen that helps in the formation of blood clots, and globulins that provides antibodies to fight against bacteria and viruses.
Check answers.
1. The active site
A. Located in an enzyme (my answer)
B. Is rich in amino acid
C. Is located on a substrate
D. A and B
E. B and C
2. Anabolism is defined as the
A. Sum of all chemical reactions
B. Degradation of polymers in monomers
C. Synthesis of polymers from monomers (my answer)
D. Exchange of elections in chemical reactions
1) A. Located in an enzyme
2) C. Synthesis of polymers from monomers
You're all good!
Answer:
The active site refers to the region present in an enzyme where the binding of the substrate takes place, and the chemical reaction occurs. The amino acids of the enzyme protein combine with the substrate in the active site. Hence, for question 1 the correct answer is option A.
The two kinds of metabolic reactions occur in the cell, that is, catabolism and anabolism. In the anabolic reactions, the energy is consumed, and the small molecules combine to produce the bigger ones. Hence, for question 2 the correct answer is option C.
The molecules that make up food contain energy. How does the human body get energy from the food molecules?
A- by breaking and reforming chemical bonds in the molecules
B- by combining the molecules together
C- by using them to from ionic bonds
D- by adding energy to the molecules
Answer: A: by breaking ans reforming chemical bonds in the molecules
Explanation: There is energy stored in chemical bonds between food molecules (this is referred to as ATP, or Adenosine TriPhosphate, which is the type of energy your body uses). When chemical bonds are created, some energy is stored in those bonds (personally, I like to think that it's because the bonds need energy to stay bonded, but there is no science to prove this). When one of these bonds are broken, the energy that was stored is released, and can then be used by your body. Your body then uses a different type of energy (called ADP, or Adenosine DiPhosphate) to reform the bonds, which then go on to become waste products.
Answer:
It's A. By breaking them down and reforming chemical bonds in the molecules.
Explanation:
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The development of the brain continues past childhood. For example, if a monkey pushes a lever with its finger several thousand times a day, the _____ that controls the finger changes as a result of the experience.
Answer:
The development of the brain continues past childhood. For example, if a monkey pushes a lever with its finger several thousand times a day, the Brain tissue that controls the finger changes as a result of the experience.
A common column material used in size-exclusion chromatography is dextran, a polysaccharide of glucose. Which type of interaction most likely occurs between proteins and the dextran column material?
Answer:
Hydrogen bonding
Explanation:
A hydrogen bond is a form of the electrostatic force of attraction which takes place between the hydrogen atom and a more electronegative atom such as nitrogen, fluorine, and oxygen. Hydrogen bond falls in the category of weak forces. In size-exclusion chromatography, the type of interaction that takes place between the proteins and dextran is hydrogen bonding. The hydrogen bonding is possible because dextran, being a polysaccharide of glucose has several hydroxyl groups and thus, they get involved in the hydrogen bonding.Which of the following is often provided by anthropologists and biologists as a possible explanation for the development of bipedal hominids?
A. Standing upright allowed for sightlines over tall grasses and savannah shrubbery
B. Standing upright allowed for better tree climbing
C. Standing upright allowed for more efficient movement
D. Standing upright allowed for better foraging of tree fruits
Answer:
The answer is C. Standing upright allowed for sightlines over tall grasses and savanna shrubbery
Hope this helps!!!
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Answer:
The correct answer is option A-standing upright allowed for sightlines over tall grasses and savannah shrubbery.
Explanation:
Bipedalism or walking upright on two legs departed the hominids- Neanderthals and Homo erectus from four-legged apes. Many reasons were given to support the bipedalism of hominids like:
1. They needed to stand over tall grass to minimize the body exposure to the sun in savannah.
2. They needed to stand over tall grass to increase the sightlines to gather foods for themselves especially females and young ones which required hands to be free.
Thus, option A is the correct option.
What organs develop in the embryo during the 1st month of pregnancy?
Answer:
thus buds that eventually grow into arms and legs are formed in 1st month of pregnancy
A(n) _____ force is the overall force on an object after all the forces are added together.
Answer:
Net
Explanation:
A Net force is the overall force on an object after all the forces are added together.
Answer:
The correct answer would be Net force.
Explanation:
A force is the interaction with the object which changes the motion of that particular object when there is no opposed interaction. There are many forces which are present in the atmosphere and have impact on the objects, but such forces cannot be felt until and unless they become severe in nature. There are gravitational force, Wind Force, Frictional Force, etc. All these forces are so small that they can't be felt and the balance of the object is not disturbed. These all forces combine to make the Net Force. So Net Force is the overall force on an object after all the forces are added together.
Competent cells
are able to take up naked DNA.
are antibiotic resistant.
occur naturally.
can be created in the laboratory.
are able to take up naked DNA, occur naturally AND can be created in the laboratory.
Answer: Competent cells are able to take up naked DNA, they occur naturally and can be created in the laboratory
Explanation: Competent cells are cells that can modify its genetic make up and take other DNA using transfomation. Competent cells are commonky made from e.coli because it can replicate faster, readily available for use. DNA is cleavedusing restriction enzymes making up sticky ends.
What is the relevance of osmosis to cellular homeostasis?
Answer:
Osmosis maintains the cellular homeostasis as this allows the exchange of water and other molecules into and out of the cell.
Explanation:
Osmosis may be defined as the solute particles movement from the higher concentration region towards the region of lower concentration through the semi-permeable membrane.
Osmosis is helpful in maintaining the cellular homeostasis. Osmosis balance the ions and water molecules into and out of the cell. Only some selected particles can enter in the cell by the process of osmosis. Electrolytes balance in organisms can be performed by the process of osmosis as it allows the exchange of ions.
Which of the following are basic components of the Hardy-Weinberg model?
a.) Allele frequencies, number of individuals in the population
b.) Frequencies of two alleles in a gene pool before and after many random matings
c.) Allele frequencies, phenotype frequencies
d.) Allele frequencies in a subset of the population
Answer:
b.) Frequencies of two alleles in a gene pool before and after many random matings
Explanation:
b.) Frequencies of two alleles in a gene pool before and after many random matings
The Hardy-Weinberg model includes two basic components: the allele frequencies and the frequencies of two alleles in a gene pool before and after many random matings.
Explanation:The Hardy-Weinberg model is a principle in population genetics that describes the genetic variation in a population that is not evolving. The basic components of the Hardy-Weinberg model are allele frequencies and the frequencies of two alleles in a gene pool before and after many random matings. Therefore, the correct answer to your question is option b.) Frequencies of two alleles in a gene pool before and after many random matings.
This principle makes two fundamental assumptions - that the population is very large to minimize genetic drift, and there is random mating in the population. It essentially states that the frequency of alleles in a population will remain constant over generations unless acted upon by evolutionary influences such as genetic drift, mutation, migration or selection.
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Mike and Veronica are expecting their first child and they are nervous about all of the possible health issues a baby can face. Explain how knowing their family medical history can be useful for Mike and Veronica and their doctors as they prepare for the birth of their child.
The possibles is knowing the Medical history of the family which can
tell you what hereditary diseases the child boy/girl might be strangely have which could tell the doctors what to look for and how to solve the problem if it can be impossible to be fixed, it will also prepare the parents for what their expectations are for the their child and not be so surprised about the whole situation.
conmon disorders=heart disease, high blood pressure, stroke, certain cancers and more.. other..
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Kinesiology is
a. the science or study of movement, and the active and passive structures involved
b. the science of the morphology or structure of organisms
c. the science concerned with the normal vital processes of animal and vegetable organisms
d. the science concerned with the action of forces, internal, and external, on the living body
e. none of these
Answer:
It could be D or A but D sounds like it explains it better.
Explanation:
Since kinesiology is the study of bodily mechanics.
Answer:
I believe the correct answer is A
What percentage of people have green eyes?
Answer: 2% of people have green eyes
Explanation:
Which part of the brain that is associated with the following function:
a. Stimulus interpretation
b. Movement of tongue
c. Walking
d. Muscular movement
e. Respiratory activities
f. Hunger
Answer:
Brain is composed of three main parts: cerebrum, cerebellum and brain-stem.
Stimulus interpretation and speech are controlled by cerebrum. It is the biggest part of brain and performs important functions.
While movement of muscles, walking and movement of tongue is controlled by cerebellum. It is present under cerebrum and performs functions associated with coordination.
Respiratory activities, hunger and other automatic functions of body are controlled by Brain-stem. It connects cerebrum and cerebellum to the spinal cord.