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 communication
between cells occurs in complex multicellular
organisms, but not single-celled eukaryotes.
C. All animals have gap junctions to allow for
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.
A
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