All Free Microbiology MCQs with Answers

• A. Cytotropic
• B. Dermatotropic
• C. Chromophilic
• D. Neurotropic

Explanation: Rabies virus has a strong tropism for nervous tissue, travelling through peripheral nerves to the central nervous system, so it is…

• A. Presence of either DNA or RNA
• B. Simple structure
• C. Complex multiplication
• D. All of the above

Explanation: Viruses contain either DNA or RNA, have a relatively simple acellular structure, and multiply by complex replication processes inside…

• A. Hepatitis B virus
• B. Hepatitis C virus
• C. Hepatitis D virus
• D. Hepatitis E virus

Explanation: Hepatitis E virus is mainly transmitted by the faeco-oral route, especially through contaminated water and food.

• A. ELISA
• B. Immunodot
• C. RIPA
• D. Western Blot

Explanation: Western blot was the traditional confirmatory test after a reactive HIV screening ELISA because it identifies antibodies against specific…

• A. Robert koch
• B. Twort and d'herelle
• C. Menkin
• D. Metchinkoff

Explanation: Bacteriophages were independently recognised by Frederick Twort and Félix d’Herelle.

• A. Hepatitis B surface antigen in acute hepatitis
• B. AIDS
• C. Chronic leukemia
• D. Basal cell carcinoma

Explanation: The Australia antigen was later identified as hepatitis B surface antigen, or HBsAg, and is found in acute as well as chronic hepatitis B…

• A. in a week and reach a peak in 3 weeks
• B. only after one year
• C. no antibodies are present in primary HSV
• D. antibodies are present in recurrent and chronic apthous stomatitis

Explanation: HSV antibodies generally begin appearing during the first week of infection and rise to a peak after several weeks.

• A. 24 hours
• B. 6 hours
• C. 12 hours
• D. 3 months

Explanation: Free HIV particles in plasma have a short half-life of roughly 6 hours because they are rapidly cleared or infect target cells.

• A. Chocolate agar
• B. Robertoson's cooked-meat broth
• C. Chorio allantoic membrane
• D. Sabourad's agar

Explanation: Historically, HSV can be cultivated on the chorioallantoic membrane of embryonated eggs, producing characteristic pocks.

• A. Saliva
• B. Needle prick injury
• C. Blood transmission
• D. Sexual intercourse

Explanation: HIV is transmitted through blood, sexual exposure, and contaminated needles, but ordinary saliva does not contain enough viable virus for…

• A. Decreased virulence
• B. Increased Virulence
• C. No change
• D. None

Explanation: Exaltation means an increase in virulence, often produced by passage of an infectious agent through a suitable host or cell system.

• A. Varicella Zoster Virus
• B. Papilloma Virus
• C. Influenza Virus
• D. Human immunodeficiency virus

Explanation: Papillomaviruses are non-enveloped viruses with an icosahedral capsid, whereas varicella-zoster, influenza, and HIV possess lipid…