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  1. Which of the following elements is a constituent of biotin?
    1. Sulphur
    2. Magnesium
    3. Calcium
    4. Phosphorus
Correct Option: A

Biotin, also known as vitamin H, is a water-soluble B-vitamin. It is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, valine and in gluconeogenesis. Sulphur is a constituent of biotin.



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