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.

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.