The cell wall of Gram-negative bacteria is:

In the light of the recent classification of living organisms into three domains of life ($Bacteria$,$Archaea$,and $Eukarya$),which one of the following statements is true about $Archaea$?

In the vast marine ecosystem, certain seas develop red colouration. This red colour is due to the presence of a large population of which one of the following organisms?

The existence of the process of transformation in cyanobacteria has been experimentally established by

Some hyperthermophilic organisms that grow in highly acidic $(pH \ 2)$ habitats belong to the two groups:

Cell division in blue-green algae (Cyanobacteria) resembles which of the following?