MDCAT Pakistan · Biology
Immunity, Microbiology and Biotechnology
8 practice questions, each with the answer and an explanation.
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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 8 questions
- Which immunoglobulin isotype exists as a pentamer in serum and serves as the primary antibody produced during the initial primary humoral immune response?
- What structural component is present in the outer membrane of Gram-negative bacterial cell walls and acts as an endotoxin triggering septic shock?
- Which surface receptor molecule on human target cells is recognized and bound by the Human Immunodeficiency Virus (HIV) envelope glycoprotein gp120?
- In recombinant DNA cloning, what enzyme covalently seals phosphodiester backbone nicks between adjacent Okazaki fragments or insert and vector DNA?
- What is the primary immunological role of cytotoxic T lymphocytes (CD8+ CTLs)?
- During the lytic cycle of a virulent bacteriophage, which viral enzyme degrades the bacterial host cell wall from within to permit progeny virion release?
- Which vector system is naturally capable of transferring the Ti (tumor-inducing) plasmid into dicotyledonous plant cells for transgenic plant development?
- What type of vaccine uses an attenuated, live strain of a pathogen to stimulate strong, long-lasting cell-mediated and humoral immunity without causing full disease?
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