🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

In order for a virus to replicateAnswer: The genome must be released in the cytoplasm Which of the following viruses belong to family Flaviviridae?Answer: All of these Which of the following viruses show/s transformation of infected cells?Answer: All of these Which of the following may affect proteins and nucleic acids, but not viruses?Answer: All of these The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens inAnswer: Lysogeny Which of the following statements is not true of viruses?Answer: Viruses have been successfully grown in pure cultures in test tubes Which of the following viruses belong/s to family caliciviridae?Answer: Hepatitis E virus In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed aAnswer: Penton The size of viruses is usually measured inAnswer: Nanometers The temperate phage that have no site specificity for insertion and may even be able to insert multiple copies of their DNA into a single bacterial chromosome isAnswer: Phage Mu Enzyme neuraminidase is carried by which of the following viruses?Answer: Influenza virus Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present inAnswer: Late genes Which of the following is continuous cell line?Answer: All of these The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also calledAnswer: Immunity repressor Which of the following virus is susceptible to chloroform?Answer: All of these Group E phages haveAnswer: Single stranded RNA The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated byAnswer: Both The bacterial viruses having head made up of large capsomeres, but no tail is morphologically classified asAnswer: D Which of the following toxin causing botulism is less toxic to human beings?Answer: Type B Which of the following is a food infection?Answer: Salmonellois The staphylococcal intoxication refers to presence ofAnswer: an enterotoxin A bacterial food intoxication refers toAnswer: food borne illness caused by the presence of a bacterial toxin formed in food The method of successful treatment of botulism prior to appearance of botulism symptoms involve administration ofAnswer: antitoxin Botulism is caused by the presence of toxin developed byAnswer: Clostridium botulinum Which of the following is true to prevent botulism from smoked fish?Answer: All of the above Salmonellois is caused by theAnswer: endotoxin of Salmonella spp Group I C. botulinum strains generally includes inAnswer: all types of strains (proteolytic)A, B and F The application of Gamma rays destroys botulism toxin. The dose of gamma rays required for this purpose isAnswer: 7.3 Mrad Arrange the potencies of toxin in descending order of the following canned foodsAnswer: corn> peas>string beans>spinach The milk streptococci produce acetoin that gets spontaneously oxidized yielding a flavorings agent (responsible for aroma of butter) that isAnswer: diacetyl