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.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter6: Metabolism

Section: Chapter Questions

Problem 5RQ: DNA replication involves unwinding two strands of parent DNA, copying each strand to synthesize...

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