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