The sex factor in bacteria is:

Assertion $A$: Some bacteria are motile.
Reason $R$: Some bacteria have tubular pili or fimbriae extensions arising from their surface.
Which option is correct for Assertion $A$ and Reason $R$?

Which one of the following statements about mycoplasma is wrong?

$......$ bacteria oxidise various inorganic substances such as nitrites,ammonia and use the released energy for $\text{ATP}$ production $:-$

The structure that participates in bacterial sexual reproduction is called .........

Which of the following pigments is present in cyanobacteria?