Biology Nervous Coordination NUMS 2022
PMDC Verified Question 62 of 86
The gap between neurons at a synapse is:
A
Synaptic knob
B
Synaptic cleft
C
Synaptic delay
D
Synaptic vesicle
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Synaptic cleft
Concept:

Neurons in a chemical synapse do not physically touch; they maintain a microscopic separation.

Solution:

  • The literal physical gap (approximately 20-30 nanometers wide) separating the presynaptic terminal from the postsynaptic membrane is anatomically termed the synaptic cleft.


Why other options are incorrect:

  • Synaptic knob: The swollen end of the presynaptic axon.


  • Synaptic vesicle: The sacs inside the knob holding the neurotransmitters.


  • Synaptic delay: The brief fraction of a millisecond it takes for the chemical process to occur, not a structural space.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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