🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

CD8 surface antigen is present inAnswer: both (a) and (b) Treatment with bacterial endotoxins results blast formation inAnswer: B cells Cytotoxic T-cells can be recognized by which of the following cell surface marker?Answer: CD8 Which is not an antigen-presenting cell (or APC)?Answer: Polymorphonuclear leukocyte (or PMN) Chemically an antigen may beAnswer: any of these T cell receptors (or TCR) on CD4+ T cellsAnswer: recognize peptides associated with MHC class II molecules Which of the following proteins would not need localization signal?Answer: A cytosolic protein Following are the defenses of the colon exceptAnswer: fast flow rate Natural killer cells are involved inAnswer: all of these Which of the following(s) is/are the determinants of antigenicity?Answer: All of these Which of the following is correct?Answer: T Cell receptors are generated by random assortment of gene cassettes Immunity is not long lasting toAnswer: influenza Lysozyme is present inAnswer: saliva Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human isAnswer: CD8 The role of the M cell is toAnswer: pass bacteria or virus to underlying macrophages for processing and presentation of antigen Which of the following statements is false regarding B cells?Answer: B one marrow stem cells migrate to the thymus and develop into B cells The class of immunoglobulins which can cross the placenta isAnswer: IgG Self reactive antibodies are not found in significant concentration in normal serum becauseAnswer: B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide Simulation of which of the following will lead to appearance of first antibody to appear following stimulation by an antigen?Answer: IgM Antigen binding sites of an immunoglobulin are located inAnswer: Fab regions of the antibody Which of the following mediates Type I hypersensitivity reaction?Answer: IgE Which of the following theory of antibody production is most widely accepted?Answer: Clonal selection theory Which is the most efficient complement fixing class of antibody?Answer: IgM The class of immunoglobulin, most abundant in body isAnswer: IgG Which is not a function of IgG?Answer: First antibody type produced against an antigen during the primary antibody response J chain is present inAnswer: Both (a) and (b) Heat-labile class of immunoglobulins includeAnswer: IgE Which of the following (s) is/are function (s) of Fc fragment of IgG?Answer: All of these Which of the following is the phylogenetically oldest immunoglobulin?Answer: IgM The secretary component of sIgA isAnswer: formed by cleavage of an epithelial cell receptor used to transport the dimeric IgA across the epithelial cell