The vitamin that is required for the formation of collagen and wound healing is:
A. Vitamin D
B. Vitamin C
C. Vitamin E
D. Vitamin A
Answer: Option B
Solution (By JKExamLibrary)
Vitamin C is a cofactor for prolyl and lysyl hydroxylases, enzymes essential for collagen cross-linking and stability. Deficiency impairs wound healing and causes scurvy. Vitamin A is for epithelial integrity.
Explanation:
Meiosis is characterized by two successive divisions producing haploid gametes, and involves genetic recombination through crossing over during prophase I. Mitosis produces identical diploid cells with one division. Crossing over and independent assortment generate genetic variation. Therefore, crossing over is unique to meiosis.
Consider the following statements about vitamins:
1. Vitamin K is essential for bone health.
2. Vitamin D deficiency can cause rickets.
3. Vitamin A is also known as tocopherol.
Which of the above is/are correct?
Explanation:
Vitamin K supports bone protein osteocalcin; D deficiency causes rickets. Vitamin A is retinol; vitamin E is tocopherol. So 3 is incorrect.
Consider statements about human immunity: 1. Colostrum provides passive immunity to infants. 2. Allergies are exaggerated immune responses. 3. Autoimmune diseases occur when the immune system attacks self-cells. Which are correct?
Explanation:
Colostrum, the first milk produced by the mother, is rich in IgA antibodies, providing natural passive immunity to the newborn. Allergies (hypersensitivities) occur when the immune system overreacts to harmless environmental antigens (allergens). Autoimmune diseases arise when the immune system loses tolerance and mistakenly attacks the body's own healthy cells and tissues. All statements are correct.
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