🧬 Biochemistry Solved MCQs with Answers

Practice 1490 approved 🧬 Biochemistry questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1490 solved MCQs

Manganese is a key component of all of the following enzymes exceptAnswer: Ceruloplasmin Which of the following vitamin is essential for the absorption of calcium from the intestinal tract?Answer: Vitamin D Which trace mineral is a component of the enzyme that activates vitamin A in the eye?Answer: Zinc Chronic consumption of excess selenium can lead toAnswer: Muscle weakness, Normal glucose metabolism requiresAnswer: Chromium Manganese is needed forAnswer: Both (a) and (b) The symptoms of retinol excess areAnswer: All of the above Main function of insulin hormone is toAnswer: Increase blood sugar Ascorbic acid acts as anAnswer: Oxidizing and Reducing agent both A deficiency of thiamin produces the disease known asAnswer: Beri-Beri Acyl carrier protein (ACP) plays an important role in the biosynthesis ofAnswer: Fatty acids Vitamin B₁₂ (Cobalamin) is only synthesized byAnswer: Micro-organisms Which of the following are reduced coenzymes?Answer: NADH and FADH2 The absence of ascorbic acid in the human diet gives rise toAnswer: Pernicious anemia Vitamins are essential because the organismAnswer: Can't synthesize these compounds at all The prosthetic group biotin is a carrier of which type of molecule?Answer: Activated carbon dioxide (CO₂) Lipoic acid exists inAnswer: Oxidized and Reduced form both Vitamin B₁₂ is useful in the prevention and treatment ofAnswer: Pernicious anemia An example of a digestive hormone isAnswer: Gastrin In the co-enzyme B₁₂ the position occupied by a cyanide ion in vitamin B₁₂ is bonded directly to the __________ of the ribose of adenosine.Answer: adenine The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitaminAnswer: B₁₂(Co²⁺)to B₁₂(Co⁺) An early sign of retinol deficiencies in man isAnswer: Night blindness An enzyme, L-folate reductase reduces folic acid toAnswer: Dihydrofolic acid What compound of raw egg white causes a syndrome similar to vitamin B deficiency?Answer: Avidin The disease Beriberi is due to a dietary deficiency inAnswer: vitamin B₁ (thiamine) Which of these is a symptom of vitamin A deficiency?Answer: Blindness Vitamin-C is considered as aAnswer: Water soluble The vitamin niacin is part of the __________ molecule.Answer: NAD+ Which of these hormones is a catecholamine?Answer: Norepinephrine Dihydroorotate dehydrogenase containsAnswer: 4 flavins and 4 atoms of iron per molecule