The functional region of an antibody that binds to an antigen is called the:
A. Variable region
B. Disulfide bridge
C. Constant region
D. Fc region
Answer: Option A
Solution (By JKSSB Mock Tests)
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.
Explanation:
Viruses do not reproduce by binary fission; they replicate by hijacking host cell machinery. Binary fission is a method of asexual reproduction in bacteria. All other statements are correct.
Explanation:
Bacillus is a genus of rod-shaped bacteria, placed in Kingdom Monera because they are prokaryotic. Euglena and Paramecium are unicellular eukaryotes in Kingdom Protista. Agaricus (mushroom) belongs to Kingdom Fungi. Monera includes all prokaryotes like bacteria, cyanobacteria, and archaea. They are characterized by absence of true nucleus and membrane-bound organelles.
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