AP BIOLOGY

Detailed explanation-1: -Intracellular receptors are Globular protein receptors located inside the cell rather than on its cell membrane. The word intracellular means “within or inside a cell". Molecules that cross a cell membrane to bind with a receptor are generally nonpolar and may be relatively small.

Detailed explanation-2: -If this is not present on the plasma membrane and is present on nucleus, then it makes it as intracellular receptor. So our answer to the question which receptor is not a membrane receptor, is option Number D. That is steroid hormone receptor.

Detailed explanation-3: -Receptors can be divided into four basic classes on the basis of their structure and mechanism of action: (1)ligand-gated ion channels, (2)G protein–coupled receptors (GPCRs), (3)enzyme-linked receptors, and (4)nuclear receptors (Table 3.1; Figs.

Detailed explanation-4: -Intracellular (nuclear) receptors Examples include the thyroid hormones and the large group of steroid hormones, including glucocorticoids, mineralocorticoids and the sex steroid hormones.