Exam 3: Cell Signaling

A secreted chemical messenger meant to act on an adjacent cell is called a(n)

Which of the following functions by diffusing across the cell membrane to bind to intracellular protein receptors, resulting in gene activation or repression?

A ligand binding to a(n) _____ receptor directly results in phosphorylation

The binding of a ligand to a G protein--coupled receptor will result in activation of adenylyl cyclase, which in turn will initiate which of the following pathways?

An action potential triggers the release of a(n)

Which of the following is most likely to initiate apoptosis?