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17. In DNA, what base always pairs up with thymine? c. uracil d. guanine a. adenine b. cytosine 18. Which of the following functions do nucleotides not perform in cells? a. serve as building blocks of nucleic acids b. regulate cellular activity c. form structural components of membranes d. are sources of chemical energy 19. Which of the following statements best describes the relationship between an enzyme and a substrate? a. An enzyme is like a lock that fits a particular key, which is the substrate. b. An enzyme and a substrate form a permanent enzyme-substrate complex. c. An enzyme converts the substrate into a product and then breaks down. d. An enzyme temporarily changes its conformation so it can better accommodate a substrate.

17. In DNA, what base always pairs up with thymine? c. uracil d. guanine a. adenine b. cytosine 18. Which of the following functions do nucleotides not perform in cells? a. serve as building blocks of nucleic acids b. regulate cellular activity c. form structural components of membranes d. are sources of chemical energy 19. Which of the following statements best describes the relationship between an enzyme and a substrate? a. An enzyme is like a lock that fits a particular key, which is the substrate. b. An enzyme and a substrate form a permanent enzyme-substrate complex. c. An enzyme converts the substrate into a product and then breaks down. d. An enzyme temporarily changes its conformation so it can better accommodate a substrate.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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17. In DNA, what base always pairs up with thymine? a. adenine c. uracil d. guanine b. cytosine 18. Which of the following functions do nucleotides not perform in cells? a. serve as building blocks of nucleic acids b. regulate cellular activity c. form structural components of membranes d. are sources of chemical energy 19. Which of the following statements best describes the relationship between an enzyme and a substrate? a. An enzyme is like a lock that fits a particular key, which is the substrate. b. An enzyme and a substrate form a permanent enzyme-substrate complex. c. An enzyme converts the substrate into a product and then breaks down. d. An enzyme temporarily changes its conformation so it can better accommodate a substrate. 20. Which of the following scenarios best describes the events leading up to the situation shown in the diagram? malls charged as a. An allosteric activator binds to an allosteric site and causes the enzyme to have an affinity for its substrate. b. An allosteric inhibitor binds to an allosteric site and causes the enzyme to have low affinity for its substrate. c. A competitive inhibitor binds to the active site of an enzyme to block enzyme activity. d. A noncompetitive inhibitor binds to a site that is not the active site of an enzyme and blocks enzyme activity.
Transcribed Image Text:17. In DNA, what base always pairs up with thymine? a. adenine c. uracil d. guanine b. cytosine 18. Which of the following functions do nucleotides not perform in cells? a. serve as building blocks of nucleic acids b. regulate cellular activity c. form structural components of membranes d. are sources of chemical energy 19. Which of the following statements best describes the relationship between an enzyme and a substrate? a. An enzyme is like a lock that fits a particular key, which is the substrate. b. An enzyme and a substrate form a permanent enzyme-substrate complex. c. An enzyme converts the substrate into a product and then breaks down. d. An enzyme temporarily changes its conformation so it can better accommodate a substrate. 20. Which of the following scenarios best describes the events leading up to the situation shown in the diagram? malls charged as a. An allosteric activator binds to an allosteric site and causes the enzyme to have an affinity for its substrate. b. An allosteric inhibitor binds to an allosteric site and causes the enzyme to have low affinity for its substrate. c. A competitive inhibitor binds to the active site of an enzyme to block enzyme activity. d. A noncompetitive inhibitor binds to a site that is not the active site of an enzyme and blocks enzyme activity.
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