This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
[{'content': 'Apoproteins present in LDL \nSelect and explain. \nA. B-48, B. B-100, C. C-I, D. C-III', 'role': 'user'}, {'content': 'Answer: B \nExplanation: LOW DENSITY LIPOPROTEINS (LDL) - LDL transpos cholesterol from liver to peripheral tissues. The only apoprotein present in LDL is apo B100. Most of the LDL paicles are derived from VLDL, but a small pa is directly released from liver. The half-life of LDL in blood is about 2 days. Function of LDL - About 75% of the plasma cholesterol is incorporated into the LDL paicles. LDL transpos cholesterol from liver to the peripheral tissues. The cholesterol thus liberated in the cell has three major fates: It is used for the synthesis of other steroids like steroid hormones. Cholesterol may be incorporated into the membranes. Cholesterol may be esterified to a MUFA by acyl cholesterol acyl transferase (ACAT) for storage. The cellular content of cholesterol regulates fuher endogenous synthesis of cholesterol by regulating HMG CoA reductase. REF: DM VASUDEVAN TEXTBOOK OF BIOCHEMISTRY, SIXTH EDITION, PG.NO.,153,154.', 'role': 'assistant'}]