Gram negative bacteria possess
The Gram-negative cell wall is characterized by presence of outer membrane, a thinner peptidoglycan layer and extensive periplasmic space surrounding the peptidoglycan. The uppermost layer of the outer membrane has lipopolysaccharide. The peptidoglycan layer is composed of a macromolecule peptidoglycan/murein which is a repeating framework of long glycan chains having alternate N-acetyl glucosamine and N-acetyl muramic acid.
Thus, the correct answer is option B.
Arrange the following steps in a correct sequence as per Gram's staining technique: Treatment with $$0.5$$% iodine solution $$(1)$$, washing with water $$(2)$$, treatment with absolute alcohol/ acetone $$(3)$$, staining with weak alkaline solution of crystal violet $$(4)$$.
Select the correct option: Which of the given statements are correct? (i) Bacillus subtilis is a Gram $$(+)$$ bacteria. (ii) Escherichia coli is a Gram $$(-)$$ bacteria. (iii) Washing of the Gram's stain in Gram $$(-)$$ bacteria is due to high lipid content of the cell wall, which gets dissolved in organic solvent like acetone.
Outer layer of lipopolysaccharide is characteristic of
Wall of Gram +ve bacteria possess