🧬 Biochemistry Solved MCQs with Answers

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

1490 solved MCQs

E.coli ACP has its molecular weight as aroundAnswer: 9000 The vitamin riboflavin is part of the __________ molecule.Answer: FAD The most prominent role that tocopherol has in in-vitro systems is as a strongAnswer: Antioxidants Biotin occurs mainly in combined forms bound to protein throughAnswer: ε-N-lysine moiety Lipoic acid is a co-factor of theAnswer: Both (a) and (b) β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized byAnswer: Both Vitamin-D deficiency can causeAnswer: Rickets A deficiency of Vitamin K results in a decreased level ofAnswer: Prothrombin The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk becomeAnswer: Colorless on reduction with Zn in acid and regained its color on re-oxidation Which of the following compounds/(s) belong/(s) to the vitamin B₆ group?Answer: All of the above What metal ion is specifically bound by vitamin B₁₂?Answer: Cobalt A fat-soluble vitamin that regulates blood clotting isAnswer: Vitamin K Which of these is a vitamin A precursor?Answer: Beta-Carotene In one iron-metalloflavoprotein, the iron is present as aAnswer: Heme-protein Vitamin K₁ was first isolated from alfalalfa and has the phytyl side chain consisting ofAnswer: Four isoprene units Which of these molecules is vitamin H?Answer: Biotin The occurrence of metals such as iron or molybdenum in some flavoproteins canAnswer: Stabilize the semiquinone Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked atAnswer: Both ends by two disulfide bonds A deficiency of niacin causesAnswer: Pellagra Selenium is an essential component of the enzyme glutathione peroxidase whichAnswer: Scavenges toxic hydoperoxycompounds in tissues Who discovered vitamin C (ascorbic acid)?Answer: Albert Szent-Gyorgyi Histidine is degraded to α-ketoglutarate and is described as aAnswer: Glucogenic amino acid Which of the following amino acids is considered as both ketogenic and glucogenic?Answer: Tryptophan A glucogenic amino acid is one which is degraded toAnswer: Pyruvate or citric acid cycle intermediates Which of the following is the best described glucogenic amino acid?Answer: Valine A person with phenylketonuria cannot convertAnswer: Phenylalanine to tyrosine Oxidative deamination is the conversion of an aminoAnswer: Acid to a keto acid plus ammonia An example of a transamination process isAnswer: aspartate + α ketoglutarate = glutamate + oxaloacetate Transamination is the process whereAnswer: α-amino group is removed from the amino acid The most toxic compounds isAnswer: Phenylpyruvate