Consider the following statements about vitamins: 1. Vitamin B₁ is thiamine. 2. Vitamin B₂ is riboflavin. 3. Vitamin B₆ is pyridoxine. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about vitamins:
1. Vitamin B₁ is thiamine.
2. Vitamin B₂ is riboflavin.
3. Vitamin B₆ is pyridoxine.
Which of the above is/are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2, and 3
Answer: Option D
Solution (By JKSSB Mock Tests)
All three are correct chemical names: B₁ thiamine, B₂ riboflavin, B₆ pyridoxine.
Explanation:
The cortical reaction is a mechanism to prevent polyspermy, ensuring that only one sperm fertilizes the egg. It is triggered immediately after the plasma membrane of the sperm fuses with the plasma membrane of the oocyte. This fusion causes a sudden release of calcium ions inside the oocyte, which triggers the cortical granules (located just beneath the oocyte membrane) to release their contents into the perivitelline space. These enzymes modify the zona pellucida (zona reaction), making it impermeable to other sperm.
Explanation:
Vitamin K is required for the gamma-carboxylation of clotting factors II, VII, IX, and X, including prothrombin. Deficiency leads to prolonged clotting time and hemorrhagic disorders.
Consider statements about vitamins: 1. Vitamin B12 contains cobalt. 2. Vitamin K is essential for blood clotting. 3. Beriberi is caused by Vitamin C deficiency. Which are correct?
Explanation:
Vitamin B12 (cyanocobalamin) is a complex vitamin that contains the trace mineral cobalt. Vitamin K is essential for the synthesis of prothrombin and other clotting factors in the liver. Beriberi is caused by a deficiency of Vitamin B1 (thiamine), whereas Vitamin C deficiency causes scurvy. Thus, statements 1 and 2 are correct.
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