Biology Question on Cell: the unit of life

Question

Difference in gram ⊕ and gram bacteria is due to

Answer 1

Solution

The difference between Gram-positive (Gram +) and Gram-negative (Gram -) bacteria is primarily due to differences in their cell wall structure. So, the correct option is (A): Cell wall Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which retains the crystal violet stain used in the Gram staining procedure, giving them a purple or blue-violet color under a microscope. Gram-negative bacteria have a thinner layer of peptidoglycan in their cell walls, which does not retain the stain effectively. Instead, they have an outer membrane composed of lipopolysaccharides that can interfere with staining, giving them a pink or red color during Gram staining.