The element that is a constituent of the amino acids methionine and cysteine is: MCQ with Answer and Explanation

Explanation:
Vitamin C is a cofactor for enzymes that hydroxylate proline and lysine in procollagen, essential for proper collagen triple helix formation. Deficiency results in weak collagen and scurvy. Vitamin A is for vision, D for calcium, K for clotting.

Explanation:
The liver continuously synthesizes bile, which is essential for fat emulsification. The pancreas acts as both an exocrine and endocrine gland; its Islets of Langerhans produce insulin and glucagon. The gall bladder only stores, concentrates, and releases bile; it does not produce any digestive enzymes. Thus, statements 1 and 2 are correct.

Explanation:
Xylem vessels and tracheids are dead, hollow cells at functional maturity, providing a continuous tube for water transport. Phloem sieve tube elements are living cells at maturity, though they lack a nucleus, and are responsible for transporting organic nutrients. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth), while apical meristems are responsible for primary growth (increase in length). Thus, statements 1 and 2 are correct.