The gap between two neurons across which nerve impulses pass is called: MCQ with Answer and Explanation

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The gap between two neurons across which nerve impulses pass is called:

A. Dendrite

B. Synapse

C. Soma

D. Axon

Answer: Option B

Solution (By JKSSB Mock Tests)

A synapse is the junction between two neurons (or neuron and effector) where the nerve impulse is transmitted from the presynaptic neuron to the postsynaptic neuron, usually via neurotransmitters. Axon carries impulses away from the cell body, dendrites receive signals, soma is the cell body. Synaptic transmission can be chemical or electrical.

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Assertion (A): ATP is the energy currency of the cell.
Reason (R): It stores energy in its high-energy phosphate bonds.

A. Both A and R are true, but R is not the correct explanation.

B. Both A and R are true, and R is the correct explanation.

C. A false, R true.

D. A true, R false.

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Correct Answer: Option B

Explanation:
ATP has two high-energy anhydride bonds that release energy when hydrolyzed, driving cellular processes. R correctly explains A.

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Question #2

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The process by which water enters the root hairs from the soil is:

A. Transpiration pull

B. Active transport

C. Diffusion

D. Osmosis

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Correct Answer: Option D

Explanation:
Water moves from the soil (high water potential) into root hair cells (lower water potential due to solutes) by osmosis across the semipermeable membrane. Active transport is for minerals, transpiration pull is for upward movement.

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Question #3

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The scientist who proposed the 'one gene-one enzyme' hypothesis was:

A. Meselson and Stahl

B. Watson and Crick

C. Beadle and Tatum

D. Hershey and Chase

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Correct Answer: Option C

Explanation:
George Beadle and Edward Tatum, working with Neurospora crassa, proposed that each gene controls the synthesis of a specific enzyme (later refined to one gene-one polypeptide). Watson and Crick discovered DNA structure, Hershey-Chase confirmed DNA as genetic material, Meselson-Stahl demonstrated semi-conservative replication.

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