🧬 Biochemistry Solved MCQs with Answers

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

1490 solved MCQs

Which of the following radioactive element is generally involved in RIA?Answer: All of the above Which of the following radioactive element is generally involved in RIA?Answer: All of the above What is approximatively the half life of 32-Phosphorus?Answer: 14 days Rocket Immunodiffusion is also known asAnswer: Electroimmunodiffusion DNA- footprinting is a suitable technique for identifying which of the following?Answer: Protein binding site within DNA What would happen if serum is omitted from the ELISA, but all other steps remain same?Answer: Both (a) and (b) RAST test (radio allergosorbent test) is often used to detectAnswer: Antibodies associated with allergies (IgE) What would happen if the anti-human Ig-conjugate is not washed free of the well before the substrate is added?Answer: All wells would show uniform over-development due to unbound and excess anti-human Ig enzyme conjugate An antigen preparation and an antibody preparation are tested by immunodiffusion. Three bands are found, indicating thatAnswer: There was more than one antigen Immunoelectrophoresis techniques are designed to separate the mixture components from each other by using electrophoresisAnswer: Prior to reaction with antibody Which of the following is a positively charged matrix for ion exchange chromatographyAnswer: DEAE cellulose Which of the following is an immunoelectrophoresis technique?Answer: Both (a) and (b) Which of the following immune cells would have an especially low count in a patient with advanced AIDS?Answer: Helper T lymphocyte In cellular immunity, T lymphocytes are responsible for the recognition and killing of foreign invaders. The cells areAnswer: Both (a) and (b) Plasma cells produce thousands of __________ that are released into the bloodstreamAnswer: Antibodies If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?Answer: All of the above What is a protein produced by host cells infected by viruses?Answer: Interferon Polysaccharides on the surface of infecting microorganisms can also activate complement directly in the absence ofAnswer: Antibody via the alternative pathway Antibodies bound to an invading microorganism activate the complement system viaAnswer: Classical pathway The immune response to a booster vaccine is called a(n)Answer: Secondary response Immunological memory is due toAnswer: Long lived B cells that secrete a specific antibody What is the result of an abnormal response of the immune system to part of a person's own body?Answer: An autoimmune disease What are the solutions prepared from weakened or dead microorganisms, viruses, or toxins that provide some immunity from diseases?Answer: Vaccines During exposure to a foreign invader, there are more __________ present in the vertebrate body than before exposureAnswer: All of the above To elicit the best antibodies to mouse MHC I, it should be injected into aAnswer: Goat To detect a humoral immune response to influenza virus, it is possible to measureAnswer: Serum antibody titer Which of the following is in the lymph nodes of a person battling a cold virus?Answer: All of the above ImmunogenicityAnswer: Is not a property of haptens Which of those immunoglobulin classes is mainly found in external secretions?Answer: Ig A Cleavage of an IgG molecule by a specific protease can produceAnswer: Two Fab fragments and one Fc fragment