Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

تمرين 7

The difference between a gram-positive and gram-negative bacteria is-
A) the thickness of the peptidoglycan cell wall
B) the type of polysaccharide present in the cell wall
C) the type and amount of protein in the cell wall
D) the layers of cellulose in the cell wall