Multiple Choice
In cell biology, is exocytosis considered active transport or passive transport?
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13. Intracellular Protein Transport
Exocytosis
Multiple Choice
In the context of exocytosis at a chemical synapse, where are neurotransmitters primarily stored in a presynaptic neuron before release?
A
In the nucleus within chromatin-associated granules
B
Free in the cytosol of the presynaptic terminal
C
In synaptic vesicles clustered near the presynaptic plasma membrane
D
In the mitochondrial matrix for rapid ATP-coupled release
Verified step by step guidance1
Understand the process of exocytosis at a chemical synapse, which involves the release of neurotransmitters from the presynaptic neuron into the synaptic cleft.
Recall that neurotransmitters are chemical messengers that need to be stored in a way that allows rapid and controlled release upon stimulation.
Identify the cellular structures involved in storing neurotransmitters: synaptic vesicles are small membrane-bound compartments located near the presynaptic plasma membrane.
Recognize that neurotransmitters are not stored freely in the cytosol, nor in the nucleus or mitochondria, but are packaged inside synaptic vesicles to protect them and facilitate their release.
Conclude that the primary storage site of neurotransmitters before release is inside synaptic vesicles clustered near the presynaptic plasma membrane, ready for exocytosis.
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