Which are the first living forms?

Organisms which obtain energy by the oxidation of reduced inorganic compounds are called

Which of the following is true for Archaebacteria?

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

The nucleotide sequence in ribosomal $RNA$ provides the best evidence for the phylogeny of Monera. Based on this information,which are the most primitive Monerans?

Biochemical resemblance is generally used for the identification of which group of individuals?