Some of the blue green algae can tolerate extremes of temperature due to presence of gelatinous sheath, and compactness of protein molecules in protoplasm.

Correct Option: D

Some of the blue green algae can tolerate extremes of temperature due to presence of gelatinous sheath, and compactness of protein molecules in protoplasm.

Sex-factor or F-factor in bacteria results in high frequency conjugation. It allows bacteria to produce sex pilus necessary for conjugation.

Correct Option: B

Sex-factor or F-factor in bacteria results in high frequency conjugation. It allows bacteria to produce sex pilus necessary for conjugation.

In (E.coli) double stranded DNA is present.

Correct Option: C

In (E.coli) double stranded DNA is present.

Cyanobacteria are oxygenic photoautotroph. Many members perform nitrogen fixation.

Correct Option: A

Cyanobacteria are oxygenic photoautotroph. Many members perform nitrogen fixation.

Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils.

Correct Option: D

Archaebacteria are the most ancient and halogenous group of bacteria and are called living fossils.