🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Influenza virus undergoes antigenic shift resulting in major antigenic changes by which of the following mechanisms?Answer: Reassortment of RNA segments from different influenza viruses The nucleocapsid is covered by an outer membrane like structure calledAnswer: Envelope Which type of interferon is produced by virus-infected cells?Answer: Both (a) and (b) Fluorescence microscopy can be used for the diagnosis ofAnswer: All of these Viral matrix proteins areAnswer: Anchor the envelope of enveloped viruses Mumps vaccine is prepared from the cultures ofAnswer: Chick fibroblasts The microbes which are most likely to be completely dependent on a plant or animal host areAnswer: Viruses The two major components of viruses areAnswer: Nucleic acid and protein The transcription of the viral nucleic acid into mRNA is not necessary in case ofAnswer: RNA viruses West Nile virus can cause a disease in human beings that may be transmitted from an infected bird to a person by a mosquito. This is an example ofAnswer: Arthropod borne disease What does the positive strand in double stranded RNA viruses stands for?Answer: mRNA Which of the following characteristics would not be used to classify viruses?Answer: Type of cell wall structure Interanuclear inclusion bodies are found in cells infected withAnswer: All of the above The reovirus and influenza virus containAnswer: 10 different segments of dsRNA and 8 different segments of ssRNA respectively Which type of interferon is produced by T lymphocytes?Answer: γ Transfer of infection from cell to cell occurs mainly by direct transfer of virions viaAnswer: Plasmodesmata Intracytoplasmic inclusion bodies are found in cells infected withAnswer: All of these What is the function of positive strand in double stranded RNA viruses?Answer: Synthesis of protein Which of the following virus is transmitted by the respiratory route?Answer: All of these The predominant lipid substance found in the viral envelope isAnswer: Phospholipids Supercoiling refers to the extra turns in the structure of ds DNA due to the action ofAnswer: DNA gyrase The tissue structure deteriorates as the virus multiplies. This deterioration is calledAnswer: Cytopathic effect The structural abnormality of cells is termed asAnswer: Anaplasia The penetration of animal viruses into attached cells occur by mechanisms consisting of engulfment of whole virions by the cells in a phagocytic process calledAnswer: Viropexis Viropexis takes place in the phagocytic vacuoles and is due to the action of enzymesAnswer: lysosomal protease Negri bodies are found in cells infected withAnswer: Rabies virus The uncontrolled proliferation of cells is termed asAnswer: Hyperplasia Which of the following virus is transmitted by genital route?Answer: All of these The RNA sarcoma viruses, the most strongly transforming viruses may transform which of the following cells in a culture?Answer: All of these Plant viruses penetrate host cells through transient ores calledAnswer: Ectodesmata