The functional region of an antibody that binds to an antigen is called the: MCQ with Answer and Explanation

Question
The functional region of an antibody that binds to an antigen is called the:
A. Fc region
B. Constant region
C. Disulfide bridge
D. Variable region
Answer: Option D
Solution (By JKExamLibrary)
The variable (V) region at the tips of the antibody Y-shape contains the antigen-binding site, which is specific to a particular antigen. The constant region determines the class (IgG, IgM, etc.) and effector functions. The Fc region binds to immune cell receptors. Variability in the V region is generated by gene rearrangement, allowing immense antibody diversity.
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Question #1
The organ that detoxifies alcohol and drugs is the:
A. Kidney
B. Pancreas
C. Liver
D. Stomach
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Correct Answer: Option C

Explanation:
The liver contains enzymes (cytochrome P450 system) that metabolize and detoxify alcohol, drugs, and other xenobiotics, converting them to less toxic, excretable forms. The kidneys excrete waste, stomach digests, pancreas secretes enzymes.
This question belongs to: Science Biology
Question #2
The disease caused by the human papillomavirus (HPV) is:
A. Malaria
B. Cholera
C. Tuberculosis
D. Cervical cancer
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Correct Answer: Option D

Explanation:
Certain high-risk strains of HPV are a major cause of cervical cancer. Vaccines are available. TB is bacterial, malaria protozoan, cholera bacterial.
This question belongs to: Science Biology
Question #3
The part of the brain that connects the two cerebral hemispheres is the:
A. Pons
B. Thalamus
C. Hypothalamus
D. Corpus callosum
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Correct Answer: Option D

Explanation:
The corpus callosum is a thick band of nerve fibers that connects the left and right cerebral hemispheres, allowing interhemispheric communication. The thalamus is a sensory relay station, hypothalamus regulates homeostasis, pons is part of the brainstem. Severing the corpus callosum results in split-brain syndrome.
This question belongs to: Science Biology
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