GRE Subject Test: Biochemistry, Cell, and Molecular Biology : Help with Neural Specialization

Study concepts, example questions & explanations for GRE Subject Test: Biochemistry, Cell, and Molecular Biology

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All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources

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Example Questions

Example Question #1 :Specialized Structures

Neurons transmit signals via transmission of an electrical signal called an action potential. Which integral membrane protein is crucial for the rising phase of an action potential?

可能的答案:

Voltage-gated sodium channels

Ligand gated sodium channels

Voltage-gated potassium channels

Ligand gated calcium channels

Metabotropic glutamate receptors

Correct answer:

Voltage-gated sodium channels

Explanation:

Voltage gated sodium channels allow the influx of sodium to quickly depolarize the neuron and generate the action potential. They are voltage gated, meaning they open in response to changes in membrane potential, thus providing the positive feedback required to get such a dramatic change in membrane potential once threshold has been reached. The other channels listed are not involved with the rising phase of the action potential.

Example Question #66 :Cell Biology

In synaptic transmission, the__________of the pre-synaptic cell can make either a chemical or electrical synapse with a__________of the post-synaptic cell.

可能的答案:

soma . . . dendrite

spine . . . dendrite

axon . . . nucleus

dendrite . . . axon

axon . . . dendrite

Correct answer:

axon . . . dendrite

Explanation:

Of all the choices, axon and dendrite are the best answers to fill in the blanks because the axon is typically the pre-synaptic structure and the dendrite is the post-synaptic structure. In each of the other selections at least one of the choices does not make sense as a post/pre synaptic structure, or has nothing to do with synaptic transmission.

All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources

1 Diagnostic Test 201 Practice Tests Question of the Day Flashcards Learn by Concept
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