Hormones
A) are all of similar chemical composition.
B) combine with specific receptors on the target cell's surface or inside the target cell.
C) are secreted at a constant rate.
D) are also known as paracrines
E) all of these answers.

Question

Quizplus · Accepted Answer

Hormones combine with specific receptors on the target cell's surface or inside the target cell, triggering a response from the cell. This is how hormones exert their effects on the body.

Answer: E
 While hormones are not all of similar chemical composition, they do share some common features. They all function as signaling molecules, for example. Hormones also combine with specific receptors on the target cell's surface or inside the target cell, and they are not secreted at a constant rate. Hormones are not known as paracrines, however; paracrines are signaling molecules that act on nearby cells, rather than distant target cells.