Cells Can Increase Their Responsiveness to an External Chemical Regulator

Multiple Choice

Cells can increase their responsiveness to an external chemical regulator by

A) increasing the number of their transmembrane receptors by exocytosis.
B) decreasing the number of their transmembrane receptors by endocytosis.
C) uncoupling their receptors from the second message generator.
D) increasing the number of their transmembrane receptors by endocytosis.
E) mutating their extracellular receptors so that the affinity for the chemical regulator is reduced.