20) Why is ATP an important molecule in metabolism? A) Its hydrolysis provides a
ID: 151273 • Letter: 2
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20) Why is ATP an important molecule in metabolism? A) Its hydrolysis provides an input of free energy for exergonic reactions. B) It provides energy coupling between exergonic and endergonic reactions. C) Its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases free energy D) Its terminal phosphate bond has higher energy than the other two phosphate bonds. 21) The lock-and-key analogy for enzymes applies to the specificity of enzymes_ A) as they form their tertiary and quaternary structure B) binding to their substrate C) interacting with water D) interacting with ions 22) You have discovered an enzyme that can catalyze two different chemical reactions. Which of the following is most likely to be correct? A) The enzyme contains a-helices and ß-pleated sheets. B) The enzyme is subject to competitive inhibition and allosteric regulation. C) Two types of allosteric regulation occur: The binding of one molecule activates the enzyme, while the binding of a different molecule inhibits it. D) Either the enzyme has two distinct active sites or the reactants involved in the two reactions are very similar in size and shape.Explanation / Answer
20 ATP is an imp molecule in metabolism because it provides energy coupling between exergonic and endergonic reaction
21 the lock and key theory- the substrate is equal to key and enzyme is equal to lock. It explains binding of a specific enzyme with a specific substrate likewise a specific lock has a specific key
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