Which of the following statements is false? Question 11 options: 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.
Which of the following statements is false?
Question 11 options:
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Nitric oxide (NO) can interact with proteins, but it does not act by affecting membrane lipids. NO is a small, gaseous molecule that can diffuse through cell membranes and bind to intracellular proteins. This binding can activate or inhibit the activity of the proteins, which can lead to a variety of cellular responses.
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