3 Chapter 7 Kinetics and Regulation Ans E The K M is A equal to

3 chapter 7 kinetics and regulation ans e the k m is

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Chapter 7 Kinetics and Regulation Ans: E Section: 7.3 24 The K M is: A) equal to the product concentration at initial reaction conditions. B) equal to the substrate concentration when the reaction rate is half its maximal value. C) proportional to the standard free energy. D) All of the above. E) None of the above. Ans: B Section: 7.2 25 Given are five K M values for the binding of substrates to a particular enzyme. Which has the strongest affinity when k 1 is greater than k 2 ? A) 150 mM B) 0.15 mM C) 150 M D) 1.5 nM E) 15,000 pM Ans: D Section: 7.2 26 When substrate concentration is much greater than K M , the rate of catalysis is almost equal to A) K d . B) k cat. C) V max . D) All of the above. E) None of the above. Ans: C Section: 7.2 27 Which of the following is true under the following conditions: The enzyme concentration is 5 nM, the substrate concentration is 5 mM, and the K M is 5 M. A) The enzyme is saturated with substrate. B) Most of the enzyme does not have substrate bound. C) There is more enzyme than substrate. D) All of the above. E) None of the above. Ans: A Section: 7.2 28 Homotrophic effects of allosteric enzymes: A) are due to the effects of substrates. D) shift the kinetics curve to the right. B) are due to the effects of allosteric activators. E) None of the above. C) shift the kinetics curve to the left. Ans: A Section: 7.3 29 Multiple substrate enzyme reactions are divided into two classes: A) sequential reactions and double displacement reactions. B) double displacement reactions and concerted reactions. C) sequential reactions and concerted reactions. D) A and C. E) None of the above. Ans: A Section: 7.2 30 Allosteric effectors: A) can cause large changes in enzymatic activity. B) can lead to a decrease in the availability of a protein. C) do not alter the sensitivity of a metabolic pathway. D) decrease the sensitivity of the enzyme at nearly all concentrations of substrate.
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