Which of the following is a water-soluble vitamin that acts as a coenzyme in carboxylation reactions?
A. Vitamin B₁
B. Vitamin K
C. Vitamin B₇ (Biotin)
D. Vitamin A
Answer: Option C
Solution (By JKExamLibrary)
Biotin (vitamin B₇) is a water-soluble B vitamin that functions as a coenzyme for carboxylase enzymes, important in fatty acid synthesis and gluconeogenesis. Vitamin B₁ acts in decarboxylation, A and K are fat-soluble. Biotin is widely distributed in foods and also synthesized by gut bacteria.
Explanation:
Defecation is the elimination of undigested solid waste (feces) from the rectum. Urination removes liquid nitrogenous waste, exhalation removes CO₂ and water vapor, secretion is release of useful substances.
Explanation:
Entomology is the study of insects. Ichthyology is fish, herpetology reptiles and amphibians, ornithology birds. Insects are the most diverse group of animals.
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