This gene controls the operator gene in cooperation with a chemical substance called inducer present in the cytoplasm. A regulator gene is not necessarily adjacent to the operator gene which it controls. The regulator gene codes for and produces a protein called repressor.
The Gram-positive bacteria include staphylococci (staph), streptococci (strep), pneumococci, and the bacterium responsible for diphtheria (Cornynebacterium diphtheriae) and anthrax (Bacillus anthracis). The Danish bacteriologist J.M.C. Gram (1853-1938) devised a method of staining bacteria using a dye called crystal (gentian) violet. Gram's method helps distinguish between different types of bacteria. The gram-staining characteristics of bacteria are denoted as positive or negative, depending upon whether the bacteria take up and retain the crystal violet stain or not.
Gram positive and gram negative is one way of classifying a bacteria. Gram positive bacterias have a cell wall which will stain in violet color. Gram negative bacterias, how â¦ ever, have an extra layer of cell wall around them which prevents the cell wall from being dyed.acteria can have two types of cell walls. Gram-Po â¦ sitive bacteria have a relatively thick layer of peptidoglycan. Gram-negative bacteria have a much thinner layer of peptidoglycan. There are 4 basic steps to a Gram-staining.