Of the answer choices, what is the most likely reason that paracrine signaling does not activate the cell that is producing the
signaling molecule? The cell's receptors have a mutation. The neighboring cells are too far away. The concentration of the signaling molecule is not high enough. The cell does not have the proper receptor.
The correct answer is The cells do not have proper receptor.
Explanation:
During paracrine signaling a signaling molecules are generated from one cell.The generated signaling molecule then binds to the receptor of neighboring cell to carry specific signal from donor cell to the acceptor cell.
But the signaling molecules will not bind to the cell that is producing it because that producing cell do not contain proper receptor to bind that signaling molecule.
The binding of signaling molecule to the receptor of its producing cell occur during autocrine signaling.
When lactose is not present, what happens to E. coli is that the genes that produce the enzymes needed to break down lactose are not expressed. The correct answer is B.
