19. Which of the following statements is FALSE? A) Nucleotides and amino acids can act as extracellular signal molecules. B) Some signal molecules can bind directly to intracellular proteins that bind DNA and regulate gene transcription. C) Some signal molecules are transmembrane proteins. D) Dissolved gases such as nitric oxide (NO) can act as signal molecules, but because they cannot interact with proteins they must act by affecting membrane lipids. Explanation: Answer:
19. Which of the following statements is FALSE? A) Nucleotides and amino acids can act as extracellular signal molecules. B) Some signal molecules can bind directly to intracellular proteins that bind DNA and regulate gene transcription. C) Some signal molecules are transmembrane proteins. D) Dissolved gases such as nitric oxide (NO) can act as signal molecules, but because they cannot interact with proteins they must act by affecting membrane lipids. Explanation: Answer:
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter9: Cell Communication
Section: Chapter Questions
Problem 7RQ: Why are ion channels necessary to transport ions into or out of a cell? Ions are too large to...
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