List of top Microbiology Questions asked in GATE XL

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 ________.
Which of the following is/are consequence(s) of nitrous acid (HNO(_2)) mediated deamination?
Which of the following is/are active transport mechanism(s) in prokaryotes where the substance is chemically altered during transport across the membrane?
Which of the following event(s) occur(s) during translation in prokaryotes?
Who among the following scientists was the pioneer in development of chemotherapy?
In which of the following processes, glutaraldehyde is used as a sterilizing agent?
Which one of the following represents the abundance of the organisms found in soil?
Which one of the following bacterial species can cause atypical pneumonia?
Which one of the following organisms has axial filaments?
Which one of the following organisms has axial filaments?
Which of the following plant natural products is/are cyanogenic glycoside(s)?
Which of the following plant natural products is/are cyanogenic glycoside(s)?
Which of the following statements is/ are correct regarding food and water borne disease and the class of causative microorganisms?
Which of the following is/are TRUE about the Escherichia coli chromosome?
Which of the following is/are consequence(s) of nitrous acid (HNO2) mediated deamination?