Blue-green algae (Cyanobacteria) contain which type of chlorophyll?

The most common method of reproduction in prokaryotes is ........

Atmospheric nitrogen-fixation is carried on by

There is no alternation of generation in $Escherichia$ $coli$ because there is no

Which of the following prokaryotes lacks a cell wall?

Assertion: Bacteria have three basic shapes,i.e.,round,rod,spiral.
Reason: Cocci and Bacilli may form clusters or chains of a definite length.