Which of the following statements about fermentation is correct? MCQ with Answer and Explanation

Explanation:
Hemophilia A and B are X-linked recessive, affecting mostly males. Down syndrome is trisomy 21, Turner is XO, Klinefelter is XXY.

Explanation:
The pupil is the opening in the center of the iris whose size is adjusted by the iris muscles to control the amount of light entering the eye. The cornea and lens focus light, the retina senses it. In bright light, the pupil constricts; in dim light, it dilates.

Explanation:
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.