Multiple choice

What happens when a signal molecule binds to a receptor protein?

  1. a second messenger is activated inside the receiving cell

  2. the permeability of the cell changes

  3. enzyme activity is triggered in the cell

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Binding of a signal molecule to a receptor can trigger various cellular responses, including activation of second messengers, changes in membrane permeability, and alteration of enzyme activity.

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