Microbiology- Bacteria And Virus MCQ Test

47 Questions | By Themes | Last updated: Mar 22, 2022 | Total Attempts: 800

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Microbiology- Bacteria And Virus MCQ Test - Quiz

Microbiology is a discipline of biology focused on the study of microorganisms-unicellular, multicellular, or acellular. This test is about bacteria and viruses and the infection caused by them on the human body. How much do you know about it? Well, let's take this quiz and see for yourself.

Questions and Answers

1.

A 32-year-old patient with advanced AIDS, after some antimicrobial treatment, reports symptoms of esophageal dysphagia, a feeling that - after swallowing food sticks to the base of the throat. when you look at his mouth, you notice whitish coatings that can be easily removed and show the vivid red ground underneath. The most likely etiological factor of this conditions is:
- A.
  
  Herpes simplex virus
- B.
  
  Micrococcus luteus
- C.
  
  Hepatitis C virus
- D.
  
  Candida species
- E.
  
  Streptococcus pneumoniae
2.

Which of the following conditions would initiate high-level transcription of the lac operon of Escherichia coli?
- A.
  
  Low levels of glucose in the cell, and lactose present in the medium
- B.
  
  High levels of glucose in the cell, and lactose present in the medium
- C.
  
  Low levels of lactose in the call and glucose present in the medium
- D.
  
  High levels of glucose in the cell, no lactose in the medium
3.

The Virologist is going to culture the unknown, not well characterized, dsDNA-containing, most likely oncogenic, a human pathogen. He is not sure yet what type of cell culture will be most suitable for this microorganism. He decided to perform his experiment using cells, subculturing od which is difficult. He has obtained them directly from the hamster, most likely he will use which cell culture?
- A.
  
  Escherichia coli cell culture
- B.
  
  Diploid cell culture
- C.
  
  Chlamydia species culture
- D.
  
  Continuous cell culture
- E.
  
  Transformed cell culture
- F.
  
  Primary cell culture
4.

Point at the vaccine effective against the most pathogenic type pf Haemophilus species, Gram-negative highly fastidious bacteria responsible for life-threatening invasive infections in small children:
- A.
  
  Saccharide-based pure
- B.
  
  Killed
- C.
  
  Fractional
- D.
  
  Live attenuated
- E.
  
  Toxoid
- F.
  
  Protein-based subunit
5.

A relatively fixed group of microorganisms regularly found in a given area of the body at a given age is called:
- A.
  
  Resident flora/microbiota, including Enterococcus spp.
- B.
  
  Transient flora/microbiota, including Staphylococcus spp.
- C.
  
  Opportunistic pathogens, including Micrococcus sp.
- D.
  
  Fastidious microbiota, including Staphylococcus spp.
- E.
  
  Strictly pathogenic bacteria, including Staphylococcus spp.
6.

Reduction of microbial rate, with the exception of psychrotrophs (e.g. pathogenic Listeria monocytogenes will be multiplying), will be achieved in:
- A.
  
  31 Celcius
- B.
  
  35 Celcius
- C.
  
  -2 Celcius
- D.
  
  -6 Celcius
- E.
  
  6 Celcius
7.

What is the clinical meaning of methicillin-reistant coagulase-negative Staphylococcus spp.
- A.
  
  Resistant to all beta-lactam antimicronials with exception of ceftobiprole and ceftaroline
- B.
  
  Resistant to penicillins and 1st generation of cephalosporins
- C.
  
  Resistamt to penicillins and cephalosporins of all generations (with exception of cefepime) with and without beta-lactamase inhibitors
- D.
  
  Resistance to penicillins and cephalosporins of all generations without beta-lactamase inhibitors and monobactams
- E.
  
  Resistance to all the beta-lactam antibiotics
8.

Which of the following belong to the group of beta-lactam antimicrobials and are active against mecA gene-containing bacteria?
- A.
  
  Macrolides
- B.
  
  Monobactams
- C.
  
  Carbapenems
- D.
  
  Beta-lactamase inhibitors
- E.
  
  Cephalosporins 5th generation
- F.
  
  Penicillins
9.

Staphylococci are Gram-positive because they:
- A.
  
  Appear in grape-like structures under the microscope
- B.
  
  Use LPS in pathogenesis
- C.
  
  Have sterols in outer and inner cellular membrane
- D.
  
  Have thick protective peptidoglycan layer
- E.
  
  Undergo rapid binary fission
10.

Toxoid vaccine is made from a bacterial toxin that has been made harmless but that elicits an immune response against this toxin. the currently available toxoid vaccine protects against disease caused by the following toxin-releasing bacterium:
- A.
  
  Streptococcus pneumoniae
- B.
  
  Haemophilius influenzae
- C.
  
  Corynebacterium diphtheriae
- D.
  
  Neisseria meningitidis
- E.
  
  Vibrio cholerae
11.

Your patient came for a visit with a black lesion on the skin surrounded by inflamed skin. The swab was taken and on culture, large colonies grew on agar-agar medium. On the 2nd day the Gram staining was done revealing Gram-positive long bacilli with centrally localized spores. Your suspect Bacillus sp. Which are:
- A.
  
  Aerobes
- B.
  
  Aerotolerants
- C.
  
  Anaerobes
- D.
  
  Facultative anaerobes
- E.
  
  Microaerophiles
12.

Which of the following media do you need to use to transport urine from the hospital to the lab?
- A.
  
  Transport- diagnostic
- B.
  
  Selective-differential
- C.
  
  Solid
- D.
  
  Liquid
- E.
  
  Enriched
13.

Which of the Cephalosporins is active against methicillin-resistant Staphylococcus.aureus?
- A.
  
  Cefotaxime
- B.
  
  Cefepime
- C.
  
  Ceftriaxone
- D.
  
  Cefoxitin
- E.
  
  Ceftazidime
- F.
  
  Ceftaroline
14.

Point at the compound found in saliva or tears, that destroys bacteria:
- A.
  
  Lysozyme
- B.
  
  Collagenase
- C.
  
  Endotoxin
- D.
  
  Hyaluronidase
- E.
  
  Lactic acid
15.

Which of the following classes of antimicrobial agents are narrow spectrum and primarily the one useful against aerobic Gram-negative bacteria?
- A.
  
  Aminoglycosides
- B.
  
  Glycopeptidase
- C.
  
  Lipopeptidase
- D.
  
  Lincosamides
- E.
  
  Nitroimidazoles
16.

Which of the following is a limitation of the autoclave?
- A.
  
  It lacks the ability to inactivate HIV
- B.
  
  It can't be used to sterilize glass Petri dishes with bacterial cultures
- C.
  
  It will destroy some plastic Eppendorf's
- D.
  
  Requires a lot of chemical substances into it
- E.
  
  It lacks the ability to kill clostridium spp.
17.

Catabolite activator protein (CAP) acts as the sensor of:
- A.
  
  Glucose
- B.
  
  Maltose
- C.
  
  Mannitol
- D.
  
  Lactose
- E.
  
  Sucrose
18.

Point at the most common carbapenemase currently?
- A.
  
  KPC
- B.
  
  NDM-1
- C.
  
  VIM
- D.
  
  IMP
- E.
  
  OXA-48
19.

Which of the following laboratory techniques used in the diagnostics of viral infections is based on antigen-antibody interaction?
- A.
  
  Complement fixation test
- B.
  
  Enzyme-linked immunosorbent assay
- C.
  
  CPE neutralization test
- D.
  
  Nucleic acid hybridization
- E.
  
  Hemagglutination inhibition test
- F.
  
  Western blot
20.

The lab analysis has shown that a 24-year-old female patient suffers from meningitis caused by the virus (multinucleated giant cells are being seen in the tissue culture). Point at the most probable factor for this condition:
- A.
  
  Herpesvirus
- B.
  
  Poliovirus
- C.
  
  Human immunodeficiency virus
- D.
  
  Polyomavirus
- E.
  
  Rabies virus
21.

Which of the following methods used to control the level of microbial contamination uses 135 celsius for 15 mins?
- A.
  
  Pasteurization
- B.
  
  Decoction
- C.
  
  Steam sterilization
- D.
  
  Tyndallization
- E.
  
  Flaming
22.

Sputum testing revealed the presence of acid-fast bacteria called?
- A.
  
  Mycobacterium sp.
- B.
  
  Staphylococcus sp.
- C.
  
  Candida sp.
- D.
  
  Streptococcus sp.
- E.
  
  Bacillus sp.
23.

Point at the most sensitive method of bacterial identification:
- A.
  
  Agglutination test
- B.
  
  PCR method
- C.
  
  Enzyme immunoassay
- D.
  
  Catalase test
- E.
  
  API test
24.

The level of serum transaminases, enzymes that catalyze the interconversion of amino acids and oxoacids by transfer of amino groups, increases significantly during infection caused by:
- A.
  
  Hepatotrophic viral species
- B.
  
  Syncytium-producing viral species
- C.
  
  Spore-forming bacterial species
- D.
  
  Strictly anaerobic bacterial species
- E.
  
  Fastidious bacterial species
25.

Injection of foreign DNA by a bacteriophage into the host bacterium is called:
- A.
  
  Conjegation
- B.
  
  Transformation
- C.
  
  Co-transformation
- D.
  
  Transduction
- E.
  
  Transfection