What is the effect of increasing shield size on acetylcholine's stability and activity?

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Multiple Choice

What is the effect of increasing shield size on acetylcholine's stability and activity?

Explanation:
Increasing shield size around acetylcholine mainly adds steric protection around the molecule, making it harder for acetylcholinesterase to access and hydrolyze the ester bond. That slows degradation, so stability goes up. But the same bulkiness can interfere with fitting into the receptor binding site, reducing affinity and efficacy at the acetylcholine receptors. So you get higher stability but lower activity. This explains why the best answer is that stability increases while activity decreases.

Increasing shield size around acetylcholine mainly adds steric protection around the molecule, making it harder for acetylcholinesterase to access and hydrolyze the ester bond. That slows degradation, so stability goes up. But the same bulkiness can interfere with fitting into the receptor binding site, reducing affinity and efficacy at the acetylcholine receptors. So you get higher stability but lower activity. This explains why the best answer is that stability increases while activity decreases.

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