Bacteria are included in which of the following kingdoms?

The bacterial genome refers to the total number of genes located upon a

$Thiobacillus$ $ferrooxidans$ liberates energy by oxidizing:

Assertion $A$: Bacillus and Coccus types of bacteria are found in colonial forms.
Reason $R$: In bacteria,cells formed by cell division remain surrounded by a secreted mucilaginous substance.
Which option is correct for Assertion $A$ and Reason $R$?

Which of the following is a characteristic of thermoacidophiles?

Chromatophores are absent in