The junction between two neurons where neurotransmitters are released is the: MCQ with Answer and Explanation

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The junction between two neurons where neurotransmitters are released is the:

A. Node of Ranvier

B. Synapse

C. Dendrite

D. Axon hillock

Answer: Option B

Solution (By JKExamLibrary)

A synapse is a specialized junction where the axon terminal of one neuron communicates with the dendrite or cell body of another neuron via neurotransmitters. The axon hillock is where action potential initiates, nodes of Ranvier are gaps in myelin sheath, dendrites receive signals.

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Question #1

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The process by which the neural plate forms the neural tube during embryonic development is:

A. Organogenesis

B. Cleavage

C. Neurulation

D. Gastrulation

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Correct Answer: Option C

Explanation:
Neurulation involves the folding of the neural plate to form the neural tube, which becomes the brain and spinal cord. Gastrulation forms germ layers.

This question belongs to: Science Biology

Question #2

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The organelle that is the site of the Krebs cycle in the cell is the:

A. Inner mitochondrial membrane

B. Mitochondrial matrix

C. Chloroplast stroma

D. Cytoplasm

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Correct Answer: Option B

Explanation:
The Krebs cycle (citric acid cycle) occurs in the mitochondrial matrix in eukaryotes. The enzymes for the cycle are soluble in the matrix. The inner membrane houses the electron transport chain and ATP synthase. Cytoplasm is the site of glycolysis, chloroplast stroma is the site of the Calvin cycle. Thus, the matrix is the correct location.

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Question #3

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Consider statements about scientists: 1. Carolus Linnaeus developed binomial nomenclature. 2. Louis Pasteur developed the rabies vaccine. 3. Gregor Mendel discovered the structure of DNA. Which are correct?

A. 1, 2 and 3

B. 2 and 3 only

C. 1 and 2 only

D. 1 and 3 only

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Correct Answer: Option C

Explanation:
Carolus Linnaeus, a Swedish botanist, formalized the system of binomial nomenclature for naming organisms. Louis Pasteur made immense contributions to microbiology, including the development of the first effective vaccine against rabies. Gregor Mendel is the father of genetics, known for his laws of inheritance; the structure of DNA was discovered by Watson and Crick. Thus, statements 1 and 2 are correct.

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