The smallest known bacteria is:

Select the mismatched pair from the following.

True sexual reproduction is absent in........

Assertion: Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason: The outer face of the outer membrane of Gram-negative bacteria contains lipopolysaccharides,a part of which is integrated into the membrane lipids.

The habitat of $E. coli$ is

Which of the following is an example of a prokaryotic organism?