How Much Do You Really Know About Microbiology?

10 Questions | By Pgblazer | Last updated: Jun 4, 2019

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How Much Do You Really Know About Microbiology?

There are different organisms on the earth and some we can see with a naked eye while others you cannot. Microbiology gives the student a chance to study microorganisms such as bacteria and viruses. The quiz below is designed to help you figure out how attentive you have been when it comes to microbiology class. Take it up and see just how well you will do!

Questions and Answers

1.

With reference to Bacteroides fragilis the following statements are true except-
- A.
  
  B. fragilis is the most frequent anaerobe isolated from clinical samples.
- B.
  
  B. fragilis is not uniformly sensitive to metronidazole
- C.
  
  The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin
- D.
  
  Shock and disseminated intravascular coagulation are common in Bacteriodes bacteremia
2.

A child had pustular lesion on leg. On gram staining gram positive cocci are seen. To establish the diagnosis of Group A streptococcal erythroderma, the test used is

Discuss
- A.
  
  Bile solubility test
- B.
  
  Catalase test
- C.
  
  Optochin sensitivity
- D.
  
  Bacitracin sensitivity
3.

Cholera toxin:
- A.
  
  Increases the levels of intracellular cylic GMP
- B.
  
  Acts through the opoid receptors
- C.
  
  Causes continued activation of adenylate cyclase
- D.
  
  Lnhibits the enzyme phosphodiesterase
4.

A patient admitted to an ICU is on central venous line for the last one week. He is on ceftazidime and amikacin. After 7 days of antibiotics he develops a spike of fever an his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is:

Discuss
- A.
  
  Staphylococcus aureus
- B.
  
  Viridans streptococci
- C.
  
  Enterococcus faecalis
- D.
  
  Coagulase negative Staphylococcus
5.

An infant had high grade fever and respiratory distress at the time of presentation to the emergency room. The sample collected for blood culture was subsequently positive showing growth of a haemolytic colonies. On Gram staining these were gram positive cocci. In the screening test for identification, the suspected pathogen is likely to be susceptible to the following agent:

Discuss
- A.
  
  Bacitracin
- B.
  
  Novobiocin
- C.
  
  Optochin
- D.
  
  Oxacillin
6.

ln the gut, anaerobic bacteria outnumber the aerobes by a ratio of
- A.
  
  10:1
- B.
  
  100:1
- C.
  
  1000:1
- D.
  
  10,000:1
7.

A veterinary doctor had pyrexia of unknown origin. His blood culture in special laboratory media was positive for gram-negative short bacilli which was oxidase positive. Which one of the following is the likely organism grown in culture?

Discuss
- A.
  
  Pasteurella spp
- B.
  
  Francisella spp
- C.
  
  Bartonella spp
- D.
  
  Brucella spp
8.

A young boy had a flea bite while working in a wheat grain godown. After 5 days he developed fever and had axillary lymphadenopathy. A smear was sent to the laboratory to perform a specific staining. Which one of the following staining method would help in the identification of the suspected pathogen:

Discuss
- A.
  
  Albert staining
- B.
  
  Ziehl Neelsen staining
- C.
  
  McFadyen’s staining
- D.
  
  Wayson staining
9.

Which one of the following statement is true regarding pathogenicity of Mycobacteria species?

Discuss
- A.
  
  M. tuberculosis is more pathogenic than M. bovis to humans
- B.
  
  M. Kansasii can cause a disease indistinguishable from tuberculosis
- C.
  
  M Africanum infection is acquired from an environmental source
- D.
  
  M. Marinum is responsible for tubercular lymphadenopathy
10.

A VDRL reactive mother gave birth to an infant. All of the following would help in determining the risk of transmission to the infant except:

Discuss
- A.
  
  TPHA test on the serum sample of the mother
- B.
  
  TPHA test on the serum sample of the infant
- C.
  
  VDRL on the paired serum sample of the infant and mother
- D.
  
  Time interval between the treatment of the mother and her delivery

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