Which of the Following Statements About Cell Signaling Is CORRECT

question 144

Multiple Choice

Which of the following statements about cell signaling is CORRECT?

• A)Signaling pathways and the molecules involved (e.g., kinases)evolved before the evolutionary split between plants and animals and thus are similar in the two groups.
• B)Molecular mechanisms for signaling between cells exist in complex multicellular organisms, but not single-celled eukaryotes.
• C)All animals have gap junctions to allow targeted signaling between cells.
• D)Signaling molecules are generally polysaccharides that activate receptors on target cells and activate or repress gene expression.
• E)Only cells on the exterior surface of an organism have receptors to detect environmental signals.

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