Signal molecules activate intracellular receptors in
A)chromosomes.
B)vesicles.
C)target cells.
D)skin cells.
E)surface cells.

Question

Quizplus · Accepted Answer

Signal molecules are released from one cell to affect changes in another cell. These molecules are recognized by specific receptors on the target cell, which can be located on the cell surface or inside the cell. Intracellular receptors are located inside the cell and are activated by signal molecules that can diffuse across the cell membrane, such as steroid hormones. Therefore, the best choice is (C) target cells, which are the site of action for signal molecules and have intracellular receptors that can be activated by these molecules.

Signal Molecules Activate Intracellular Receptors in