Cells Can Control Their Responsiveness to External Chemical Regulators by

Multiple Choice

Cells can control their responsiveness to external chemical regulators 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) Both increasing the number of their transmembrane receptors by exocytosis and decreasing the number of their transmembrane receptors by endocytosis are correct
E) Both decreasing the number of their transmembrane receptors by endocytosis and uncoupling their receptors from the second message generator are correct