TLS Online TPP Program

#Question id: 34078


In the pour plate method, which of the following steps are involved?

#XL - S Microbiology
  1. Mixing a diluted microbial sample with molten agar at approximately 45°C.
  2. Pouring the mixture into a sterile Petri dish and allowing it to solidify.
  3. Incubating the plate at an appropriate temperature to allow colony formation.
  4. Spreading the sample evenly over the surface of the agar with a sterile spreader. 
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TLS Online TPP Program

#Question id: 31418

#XL - S Microbiology

Which nutritional group does a bacterium belong to if it obtains energy from a chemical source, with 𝐶𝑂2 as the principal carbon source, and an inorganic electron donor?

TLS Online TPP Program

#Question id: 31419

#XL - S Microbiology

Twitching motility in bacteria is primarily mediated by:

TLS Online TPP Program

#Question id: 31420

#XL - S Microbiology

In twitching motility, the retraction of Type IV pili is powered by:

TLS Online TPP Program

#Question id: 31421

#XL - S Microbiology

Which option(s) correctly match(es) the Adherence factor in a bacterial cell (Column I) with their corresponding functions (Column II). 

 COLUMN I COLUMN II
 P. Fimbriae i. Cell envelopes of some archaeobacteria that may promote adherence to surfaces 
 Q. Glycocalyx ii. help attach bacteria to other bacteria or to solid surfaces
 R. S layer iii. Cell wall components in gram-positive bacteria that aid in adhesion
 S. Teichoic acid iv. viscous (sticky) and gelatinous polymer

TLS Online TPP Program

#Question id: 31422

#XL - S Microbiology

Which type of bacteria have flagella spread evenly over their entire surface?

TLS Online TPP Program

#Question id: 31423

#XL - S Microbiology

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

 COLUMN I COLUMN II
 P. Psychrotrophs i. Can grow at 180°C or Higher
 Q. Thermophile ii. pH greater than 8
 R. Alkalophile iii. Optimum 30°C to maximum around 35°C
 S. Halophile iv. Growth more rapid at high hydrostatic pressure 
 v. Salt concentration greater than 2M