Question

17.
Which group of bacteria is gram
positive ?
(1) Erwinia-Bacillus
(2) Erwinia-Xylella
(3) Clavibacter-Xanthomonas
(4) Clavibacter-Pseudomonas​

Answer 1

Answer:

This is due to retention of the purple crystal violet stain in the thick peptidoglycan layer of the cell wall. Examples of Gram positive bacteria include all staphylococci, all streptococci and some listeria species.

The Gram-positive bacteria include staphylococci ("staph"), streptococci ("strep"), pneumococci, and the bacterium responsible for diphtheria (Cornynebacterium diphtheriae) and anthrax (Bacillus anthracis).