AP BIOLOGY

THE CELL

CELL COMMUNICATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is true about a hydrophilic signaling molecule?
A
Its receptor is located in the cytosol of the target cell
B
It might trigger a signal cascade that causes some effect in a cell
C
Since it can enter the cell, it directly affects some specific cell process
D
It is a steroid
Explanation: 

Detailed explanation-1: -Hydrophilic signaling molecules, or ligands, act by binding to receptor proteins on the surface of target cells. Hydrophobic ligands are transported through the blood stream attached to a hydrophilic carrier. When released, they can pass through the membrane and bind to intracellular receptors.

Detailed explanation-2: -Expert-Verified Answer Cell signaling is necessary for multicellular organisms to control several processes.

Detailed explanation-3: -The neurotransmitters are hydrophilic molecules that bind to cell surface receptors.

Detailed explanation-4: -When a signaling molecule binds to its receptor, it alters the shape or activity of the receptor, triggering a change inside of the cell. Signaling molecules are often called ligands, a general term for molecules that bind specifically to other molecules (such as receptors).

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