Question

98. Isolated colonies of Proteus can be obtained upon culturing it on Blood agar plate.                                         

A. True                

B. False

99. Aerobic bacteria that prefer high CO₂ concentration can be grown in a candle jar.                           

A. True                 

B. False                                                                

100. The location and combination of light-retarding and light-absorbing material on the diffraction plate determine the degree of contrast in phase microscopy.                                                                            

A. True                

B. False

Answer 1

Answer - False.

Explanation - As because isolated colonies are formed using other media such as the MacConkey. While in blood agar it forms a thin filmy layer of concentric circles ( swarming).

It is bacteria belonging to a genus of Gram-negative bacteria. Proteus bacilli are found in decomposing animal matter, sewage, manure soil, the mammalian intestine, and human and animal feces. They are opportunistic pathogens, responsible for causing urinary and septic infections, often nosocomial.

Answer 2 - False

Explanation - Anaerobic bacteria are the one which prefer high CO2 concentration can be grown in a candle jar. Bacteria that grow best in a higher concentration of CO2 and a lower concentration of oxygen are called capnophiles.

Aerobic bacteria cannot survive in high CO2 concentrations.

Answer 3 - True.

Explanation -

Even though unpolarized white light is used to illuminate the specimen, interference is
possible because, for any given incident light wavetrain that passes through a specimen
structure the resulting diffracted and direct wavetrains will be partially coherent.