🧬 Biochemistry Solved MCQs with Answers

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

1490 solved MCQs

CD antigensAnswer: Function as receptors for cytokine and CAMs A virus vaccine that can activate cytotoxic T cells must containAnswer: Live virus The ability of an antigen to induce an immune response does not depend on the antigen'sAnswer: Ability to enter the thyroid The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is thereforeAnswer: Both Lack of reaction to our own human leukocyte antigens (HLAs) is known as?Answer: Tolerance Which of the following components of the vertebrate immune response occurs first upon invasion by a virus or bacterium?Answer: The inflammatory response Which of the following white blood cells act as scavengers when they engulf and digest pathogens?Answer: Macrophages A cell which defends against body cells in which viruses are reproducing isAnswer: Cytotoxic T cell Which of the following is most likely to produce anaphylaxis in a susceptible individual?Answer: Bee sting What type of B cell remains dormant in the body, but can respond rapidly if the same antigen appears again?Answer: Memory cells The maturation of T cells and the production of particular T cell receptors occurs in theAnswer: Thymus gland Which of the following provide specific defense against viruses and bacteria?Answer: B cells Which of these is a type of specific defense against pathogens?Answer: Lymphocytes In animals, blood clots serve the function ofAnswer: Repairing damage to the body wall What is the result of invasion of a body by pathogens?Answer: Infection What is the behavior in which T cells and B cells constantly travel throughout the body seeking out and destroying foreign substances?Answer: Immune surveillance In a fetus, where are lymphocytes produced?Answer: In the liver Which of the following produces the antibodies employed in the specific immune response of vertebrates?Answer: B lymphocytes Which of the following is not part of the vertebrate immune system?Answer: Cardiac glycosides The protein, produced by B cells that binds to a specific antigen isAnswer: Antibody Which of the following characteristics are common in lymphocytes, macrophages, and neutrophils?Answer: They are all types of white blood cells Which of the following blood proteins can destroy pathogens?Answer: Complement system Which of these is part of the lymphoid system in humans?Answer: Tonsils What type of B cell is like a tiny factory that produces antibodies identical to the B cell receptor that bind to the original antigen?Answer: Plasma cells Enzyme-driven metabolic pathways can be made more efficient byAnswer: All of the above Which of the following (s) is/are serine proteases?Answer: All of the above Which of the following statements about enzymes or their function is true?Answer: All of the above Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist ofAnswer: Two proteins designated A and B What is the specificity of the Clostripain protease?Answer: It cleave after Arg residues The proteolysis rate enhancement by chymotrypsin (~10¹⁰ folds) corresponds to a reduction in activation energy of aboutAnswer: 58 kJ/mol