Most abundant in bone: (A) Alanine, (B) Hydroxyproline, (C) Lysine, (D) Arginine
Answer is B. Hydroxyproline is catabolized more or less similar to proline. It is confer strength to fibrous proteins like collagen , elastin, keratin.etc.In vitamin C deficiency hydroxyproline synthesis is reduced , causing strength of fibers , leading to scurvy. The excretion of hydroxyproline in urine is increased in tumours infiltrating bones and in diabetic patients due to enhanced rate of protein catabolism. REFERENCE: DM.VASUDEVAN.TEXTBOOK SEVENTH EDITION ;PAGE NO : 244