Which of the following is best suited for allowing quick responses (seconds or minutes) by a cell to hormones from a gland?
a. G protein-coupled receptors
b. intracellular receptors
c. both G protein-coupled receptors and intracellular receptors work on a roughly equal time frame
d. none of the above: responses to hormones occur much slower than seconds or minutes
e. none of the above: it is currently unknown how the rates compare