Question

which of the following is the enzyme that breaks down acetylcholine in the synaptic cleft?
tropomyosin
cholinesterase
acetylcholinesterase
troponin
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Explanation:

Acetylcholinesterase is the specific enzyme that breaks down acetylcholine in the synaptic cleft, terminating its action. Tropomyosin and troponin are related to muscle - contraction and not involved in acetylcholine breakdown. Cholinesterase is a general term for enzymes that hydrolyze choline - esters, but the specific one for acetylcholine in the synaptic cleft is acetylcholinesterase.

Answer:

C. Acetylcholinesterase