Question

Gram $(-)$ bacteria differ from Gram $(+)$ bacteria is having ____________.

• A. Thick wall
• B. Complex wall
• C. Simple wall
• D. Absence of wall lipids

Answer 1

The correct option is A Thick wall

Gram positive bacteria differ from Gram negative bacteria in the structure of their cell wall. Gram positive bacteria do not have an outer cell membrane that is present in Gram negative bacteria. The cell wall of Gram positive bacteria have a thick, multi-layered peptidoglycan layer.

Hence, it retains the crystal violet dye in gram staining. Gram negative bacteria have a thin, single layer of peptidoglycan. Hence, it does not retain the crystal violet dye in gram staining. Gram positive bacteria have techoic acids in the cell wall whereas Gram negative bacteria do not. Gram positive bacteria have low level of lipid content. Gram negative bacteria have high content of lipid, lipopolysaccharide.

Thus, the correct answer is 'Thick wall.'