🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Which of the following gram-negative bacteria is/are not aerobic?Answer: Escherichia The enzyme, which hydrolyses the murein isAnswer: lysozyme Bacterial spoilage is identified by which of the following morphological characteristics?Answer: All of these Bacteria areAnswer: saprophytic Gram-negative bacteria, responsible for food poisoning, is/areAnswer: Salmonella Coliform bacteria on fermentation of carbohydrates yieldsAnswer: all of these Gram-negative bacterium is/areAnswer: Escherichia Thermus thermopiles is aAnswer: gram negative eubacteria Which of the following is a gram-positive bacteria?Answer: All of these The bacteria which is novobiocin resistant isAnswer: S saprophyticus The bacteria which are inhibited on crystal violet (1:500,000) blood agar, is/areAnswer: Staphylococci Which of the following Staphylococcal haemolysins does not possess leucocidal activity?Answer: β haemolysin The genus/genera that belongs to the family Micrococcaceae isAnswer: All of these Identify the bacteria which is oxidase-negative and catalase-positive?Answer: Staphylococcus Coagulase-reacting factor is necessary forAnswer: tube coagulase test Bacteria which produces coagulase isAnswer: S aureus Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food afterAnswer: 2-6 hours Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs?Answer: α haemolysin The toxin of Staphylococcus aureus that may result into scalded skin syndrome isAnswer: Epidermolytic toxin The bacteria which can ferment mannitol anaerobically isAnswer: Staphylococcus aureus Protein A is found in cell wall ofAnswer: Staphylococcus aureus The most common cause of cystitis (after Escherichia coli) in healthy sexually active women isAnswer: Staphylococcus saprophyticus Which of the following can be used to detect clumping factor?Answer: slide coagulase test Most strains of Staphylococcus aureus indicateAnswer: all of the above The bacteria involved in the production of dental caries is/areAnswer: Both (a) and (b) Which of the following test indicates the susceptibility to streptococcal pyrogenic exotoxin?Answer: Disk test Which of the following condition is non-suppurative sequelae of Streptococcus pyogenes infections?Answer: All of these Which of the following cross-reacts with cell wall carbohydrate of Streptococcus pyogenes?Answer: Cardiac valves Streptococcus pyogenes can be differentiated from other haemolytic Streptococci on the basis ofAnswer: Bacitracin sensitivity Streptolysin O isAnswer: all of these