1) Once acetylcholine is released into the synapse it.. a. is actively pumped ba

Question

1) Once acetylcholine is released into the synapse it.. a. is actively pumped back into the presynaptic neuron. b. is broken down by peptidases c. is inactivated by calcium d. is broken down by acetylcholinesterase. 2) Which one of the following proteins is the calcium sensor that triggers synaptic vesicle exocytosis? a. Synaptotagmin b. Synapsin c. SNAP-25 d. Synaptobrevin 3) Which of the following best pairs neuron structure with function? a.Voltage-gated calcium channels - endocytosis b.Voltage-gated sodium channels - action potential repolarization phase c. Synaptobrevin- vesicle priming d.SNAP-25- clathrin recruitment

Explanation / Answer

Ans-1 the correct option is (D) i.e. is broken down by acetylcholinesterase.

Because after opening of ion gated channel it get removed from receptors and is broken down by the enzyme acetyltransferase.

Ans-2 the correct option is (A) i.e. synaptotagmin

Because this protein is coded by SYT gene and it is known as calcium sensor.

Ans-3 the correct option is (C) i.e. synaptobrevin - vesicle priming

Because it is a vesicle associated family protein which makes SNARE complex.

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