EVERYDAY SCIENCE

Detailed explanation-1: -No, bacterial cells lack a cell membrane. Instead of a cell membrane, they contain the cell envelope, which is an outer membrane of prokaryotic cells.

Detailed explanation-2: -The cell membrane is surrounded by a cell wall in all bacteria except one group, the Mollicutes, which includes pathogens such as the mycoplasmas. The composition of the cell wall varies among species and is an important character for identifying and classifying bacteria.

Detailed explanation-3: -Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall, which itself is surrounded by an outer membrane containing lipopolysaccharide. Gram-positive bacteria lack an outer membrane but are surrounded by layers of peptidoglycan many times thicker than is found in the Gram-negatives.

Detailed explanation-4: -Bacteria have a well-defined cell wall composed of peptidoglycan. It protects the bacteria from outer environment and can also confer pathogenicity. Gram-negative bacteria have two layers of cell walls, one inner peptidoglycan layer, and one outer lipopolysaccharide layer.

Detailed explanation-5: -It is important to note that not all bacteria have a cell wall. Having said that though, it is also important to note that most bacteria (about 90%) have a cell wall and they typically have one of two types: a gram positive cell wall or a gram negative cell wall.