Biologists Have Found Numerous Genes in a Single Cell That

Multiple Choice

Biologists have found numerous genes in a single cell that encode cAMP-binding proteins.Based on what you know about cAMP as a second messenger in signal transduction pathways, which statement makes a reasonable claim?

A) Only one of the cAMP-binding proteins could be a participant in a signal transduction pathway, while the others must have some other function in the cell.
B) All of the cAMP-binding proteins must be participants in the same signal transduction pathway in a cell.
C) All of the cAMP-binding proteins may be participants in different signal transduction pathways in a cell and are likely expressed at different times.
D) The genes encoding the cAMP-binding proteins are likely to be expressed whenever cAMP levels increase in the cell.
E) The genes encoding the cAMP-binding proteins are likely regulated by transcription factors that are stimulated by the same external chemical signals.