Biology

Which statement is true about the adaptations of organisms?OA. They are acquired during life.OB. They are inherited from parents.OC. They are necessary for reproduction.OD. They are learned as needed.
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The endosymbiotic theory states that nonphotosynthetic prokaryotes merged with an ancestral cell and, over evolutionary time, became___________. Some of these new cells engaged in a second merging event with a photosynthetic prokaryote, possibly a cyanobacterium. The photosynthetic prokaryote eventuallyover evolutionary timebecame __________.
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A population is made up of individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype. What is the allele frequency of A1? Answer to 2 decimal places.
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Would penicillin be expected to have an equal ability to kill both Gram-positive and Gram-negative bacteria? Why or why not?
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Marginal benefit is A. the difference between the highest price a consumer is willing to pay and the price the consumer actually pays. B. the additional benefit from consuming one more unit. C. the additional cost of producing one more unit. D. a legally determined maximum price that sellers may charge. Why is the demand curve referred to as a marginal benefit curve? A. It shows the price consumers actually pay to consume a product. B. It shows the difference between the highest price a consumer is willing to pay and the lowest price a firm would be willing to accept. C. It shows the difference between the highest price a consumer is willing to pay and the marginal benefit of consumption. D. It shows the willingness of firms to supply a product at different prices. E. It shows the willingness of consumers to purchase a product at different prices.
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Imagine that you are observing an enzyme-catalyzed reaction in the lab. Every time you add more enzyme, the reaction rate increases proportionally until the reaction rate suddenly levels off. No other chemicals were added, and no modifications were made in the experimental setting. Why do you think the reaction rate stopped increasing?
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The system that enables 4 nucleotides to dictate the sequences of millions of proteins is called the __________.
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An INHIBITORY signal is sent between neurons when __________ rushes into the neuron.A. Na+B. K+C. Cl-D. Ca-
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what is the complimentary strand to AGG-CTA_AAC
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If a peptide was composed entirely of alpha-helical structure and found to contain an integer number of complete turns, which of the following would be a possible number of amino acid residues in the peptide?A) 36 B) 60 C) 20 D) 32
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Kareem drew a diagram to compare flatworms and segmented worms. Which label belongs in the area marked X? Can reproduce sexually Are always parasites Are all sessile Are covered in setae
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Gametes are haploid, while somatic cells are diploid. What is the difference between a haploid cell and a diploid cell
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The practice of behaviors and lifestyle choices that promote both physical and mental health is called ________.
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The division of the nervous system that includes thebrain is theSelect one:a. somatic nervous systemb. peripheral nervous systemC. central nervous systemd. autonomic nervous system
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Bob adds heat to a liquid substance. When enough heat is added, A. its particles move farther apart and the substance becomes a gas. B. its particles move farther apart and the substance becomes a solid. C. its particles move closer together and the substance becomes a solid. D. its particles move closer together and the substance becomes a gas.\
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_____ genetics uses advanced technology to actually manipulate genes in order to determine their effect on behavior.
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If a student wanted to separate the colored pigments from a green leaf, the student would likely consider the separation technique of: a. crystallization b. chromatography c. filtering d. distillation
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A maglev train uses powerful magnets to lift the train above the tracks as it moves forward. Such a design reduces what following force.A rolling friction B gravityC air resistanceD fluid friction
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which tissues in plants is similar in function to the circulatory system in humans ?
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What are several adaptations that leaves have undergone? Why do leaves have adaptations in different parts of the world?
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In the United States today, about half of the corn crop is genetically engineered with a protein that is toxic to corn borers, an insect pest of corn. Which of the following conditions would be necessary for evolution of resistance to the toxic protein to occur in the corn borer? A. The corn borer must have or generate (by mutation) heritable variation in resistance to the toxic protein.B. The resistant corn borers must survive better or reproduce more than non-resistant corn borers. C. The corn borers must experience unlimited success in their ability to survive or reproduce. D. The corn borers must experience no success in their ability to survive or reproduce. E. The corn borer must lack variation in resistance to the toxic protein.
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A folding domain of a polypeptide chain has a primary structure containing 5 phenylalanine residues as shown below, where F represents the side chain of phenylalanine.F F F_|____|____|_| |F FIf this domain folds in one of the two orientations below, which is more likely - the one on the left or the one on the right?Would all the side chains be inside a circle or would they be outside a circle?a. The one on the leftb. The one on the right
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Molecules of dna are composed of long chains of
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Recovery periods following each action potential help prevent propagation of the action potential in the wrong direction. A recovery period in which the axon is not responsive to any strength of stimulus is called _______.
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