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)
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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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.
Expert Solution
Step 1
DNA is a double-stranded molecule that has a long chain of nucleotides. RNA is a single-stranded molecule which has a shorter chain of nucleotides.
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