Which of the following vitamins is required for the synthesis of collagen?
A. Vitamin A
B. Vitamin D
C. Vitamin K
D. Vitamin C
Answer: Option D
Solution (By JKExamLibrary)
Vitamin C (ascorbic acid) is a cofactor for prolyl and lysyl hydroxylase enzymes that hydroxylate proline and lysine in collagen synthesis, necessary for stabilizing collagen triple helix. Deficiency leads to impaired collagen formation, causing scurvy—fragile blood vessels, bleeding gums, poor wound healing. Vitamin A is for vision, D for bone, K for clotting.
Explanation:
Spectrophotometry measures the absorbance of light by a solution at a specific wavelength, which is proportional to the concentration of the absorbing substance (Beer-Lambert law).
Explanation:
Meiosis involves two divisions reducing the chromosome number from diploid (2n) to haploid (n), producing gametes (sperm and egg). Mitosis maintains the chromosome number and produces identical somatic cells. Amitosis is direct nuclear division, budding is asexual reproduction. Meiosis ensures genetic diversity.
Explanation:
The common garden pea is scientifically named Pisum sativum. It belongs to the family Fabaceae. Mendel chose this plant for his genetic experiments because it has easily distinguishable contrasting traits, a short generation time, and is primarily self-pollinating. Cicer arietinum is chickpea, and Phaseolus vulgaris is the common bean.
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