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4150 - Lec 1 Practice Quiz
Test your knowledge of 4150 - Lec 1 with 12 practice questions. Get instant feedback and detailed explanations to identify gaps and improve your understanding.
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Which of the following best distinguishes a first messenger from a second messenger in cellular signaling?
Incorrect
Correct answer: A first messenger is an extracellular ligand that binds a receptor; a second messenger is a small intracellular molecule that conveys the signal inside the cell.
First messengers are extracellular ligands (e.g., hormones, neurotransmitters) that bind receptors; second messengers (e.g., $Ca^{2+}$, $cAMP$, $IP_3$, DAG) are small intracellular molecules produced or released after receptor activation to propagate and amplify the signal.
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