Question

Identify the most correct choice:

Select one:

a. The time required for a bacterial population to double is called generation time.

b.

A colony is usually a mixture of various bacterial organisms.

c.

Nitrogen is required by the organisms mainly to produce ATP.

d.

Agar is a common food source for the bacteria.

e. a and c

Answer 1

Answer- A-The time required for a bacterial population to double is called generation time.

Explanation why other options are not correct is given below

B- Colony is a visible group of microorganisms which all originate from a single mother cell, hence a colony comprises a clone of bacteria which are genetically similar.

C- Nitrogen is required by organisms mainly to synthesise proteins, nucleic acids and other nitrogen-containing compounds. while some nitrogen-fixing bacteria present in root nodules and soil fix atmospheric nitrogen and produce ammonia.

D- Agar is only used as a substrate to grow bacteria, bacteria cannot digest or degrade agar therefore it just provides a surface to grow bacteria. while other nutrients are added or mixed with agar which serves as a food source for bacteria.