List of top Microbiology Questions

A penicillin sensitive Escherichia coli population is exposed to a lethal dose (200 µg/ml) of penicillin. Assuming density-independent mortality, which one of the following relationships would describe the number of surviving bacteria (N) over time (T)?
 

Correctly match the bacterial type in Column I with their corresponding environmental niche in Column II:

A polymerase chain reaction (PCR) based diagnosis test was performed on a bacterial sample targeting a specific gene. There are 3 copies of this gene in the bacterial genome. Prior to DNA extraction, the bacteria were incubated to allow one cycle of growth. 3072 amplicon copies were obtained after 9 cycles of the PCR. Assume 100% efficiency at each step. The initial bacterial count in the sample was ....... (Answer in integer)
Which one of the following metabolites is associated with bacterial stringent response?
Which of the following statements is/are true regarding the effect of the concentration of metabolic intermediates on glycolysis in erythrocytes?
Influenza viruses are RNA viruses and belong to which family:
The optimum temperature for rapid growth of mesophiles is:
The optimum temperature for rapid growth of mesophiles is:
Influenza viruses are RNA viruses and belong to which family:
A patient presents with perianal itching. A peripheral swab was taken, and the image below shows the findings. What is the most likely diagnosis?
What are nosocomial infections in a hospital setting?
Which fungi is commonly associated with urinary tract infections in catheterized patients?
Gas gangrene is caused by?
Which organisms are involved in ANUG (Acute Necrotizing Ulcerative Gingivitis)?
A fluorescence microscope with an objective lens of numerical aperture (NA) 1.5 is used with light of wavelength ((lambda)) 600 nanometers. The lateral resolution limit of this microscope rounded off to the nearest integer, is ____ nanometers.
A landfill sample was analyzed by dilution and plating techniques for viable bacterial count. When one gram of the landfill sample was diluted (1 times 10^4) (w/v) it yielded 400 CFU. The viable bacterial count (in million, rounded off to the nearest integer) in one gram landfill sample is ____.
At ( t = 0 ), the bacterial cell number is 10,000 cells/mL. At ( t = 480 ) minutes, the cell number increased to 320,000 cells/mL. The mean generation time during this exponential growth period, rounded off to the nearest integer is ____ minutes.

Which of the following is/are TRUE about the Escherichia coli chromosome?

At root nodules, which of the following C4 organic acid(s) is/are transported across the symbiosome membrane and into bacteroids?
Which of the following cocci is/are examples of division in one plane?
Which one of the following redox couples has the highest tendency to donate electrons?

Match the antibiotics in Group I with the microorganisms that produce them in Group II. 
 

Which one of the following use inorganic compounds as an energy source?

Which one of the following double-stranded sequences will NOT be recognized by a Type IIP restriction endonuclease?

The most abundant class of immunoglobulins in serum is ________.