Microbiology MCQs

1.An increase in anti-HBc antibodies in a patient typically signifies which condition?

Active acute infectionChronic carrier statusEarly symptomatic stageRecovery period

2.Which of the following causes a cytopathic effect?

3.Which of the following is a typical characteristic of viruses?

Virus particles reproduce by dividing from existing virusesThey generally measure between 200 and 3000 angstroms in sizeThey have balanced amounts of protein, lipopolysaccharides, and nucleic acidsThey possess DNA exclusively without any RNAThey are capable of independent metabolism outside host cells

4.Which opportunistic infection is most frequently observed in patients with AIDS?

5.Which of the following is NOT suitable for cultivating viruses?

6.After contracting hepatitis B via a blood transfusion, within what time frame do symptoms typically appear?

7.What does the 'window period' refer to in the context of HIV infection?

The interval between initial infection and the point when antibodies to the virus become detectableThe duration from HIV infection until the onset of AIDS symptomsThe time taken from sample collection to identifying the virus in laboratory testsNone of the above

8.Which type of cells does the Human Immunodeficiency Virus (HIV) primarily target?

ErythrocytesConnective tissue fibroblastsCD4-positive Helper T cellsMast cells involved in allergic reactions

9.Which infection is most commonly associated as a classic opportunistic infection in patients with acquired immune deficiency syndrome (AIDS)?

Aphthous ulcersMycobacterial infectionPneumocystis jirovecii pneumoniaHerpes simplex virus-induced gingivostomatitis

10.Which virus is responsible for causing influenza?

Orthomyxovirus, classified as a DNA virusParamyxovirus, identified as an RNA virusParamyxovirus, known to be a DNA virusOrthomyxovirus, categorized as an RNA virus

11.What type of virus is the Human Immunodeficiency Virus (HIV)?

12.Which virus is characterized by the presence of both intranuclear and intracytoplasmic inclusion bodies?

13.For which disease is vaccination administered after the infection has already begun?

RabiesPolioFluHerpes

14.What is the typical incubation period for herpes zoster?

15.Which statement accurately describes prions?

Primarily made up of proteins and contain no nucleic acidsA stage during which the virus is undetectable inside the host cellViruses that lack complete genetic materialViral parts are produced, but the virus fails to mature and assemble properly

16.Pigs serve as a significant reservoir for which of the following diseases?

17.From which cellular membrane does the herpes virus obtain its envelope?

It derives its envelope from the nuclear membraneIt obtains its envelope from the nucleolar membraneIt acquires its envelope from the cytoplasmic membraneNone of these options

18.Which component found in viruses enables the development of effective vaccines?

19.Viruses that have been crystallized are primarily composed of which type of biomolecule?

20.Which of the following methods can effectively inactivate the HIV virus in vitro?

Applying heat by boilingUsing ethanol as a disinfectantTreating with Cidex solutionAll the methods listed above