Why do some hormones (first messenger) need to trigger a ''second messenger" to activate a target cell?

Question

Why do some hormones (first messenger) need to trigger a ''second messenger" to activate a target cell? (A) The first messenger needs activation of ATP (B) The first messenger cannot cross a plasma membrane (C) There are no specific cell surface receptors for first messenger (D) The first messenger is not a water-soluble molecule

Tardigrade Admin · Accepted Answer

Correct answer is (b) The first messenger cannot cross a plasma membrane

Q. Why do some hormones (first messenger) need to trigger a ′′secondmessenger" to activate a target cell?

The first messenger needs activation of ATP

The first messenger cannot cross a plasma membrane

There are no specific cell surface receptors for first messenger

The first messenger is not a water-soluble molecule

Correct answer is (b) The first messenger cannot cross a plasma membrane

Q. Why do some hormones (first messenger) need to trigger a $^{''} seco n d m esse n g er "$ to activate a target cell?