Question
Biology Question on Cell: the unit of life
The bacterial cell wall is made up of
A
Cellulose
B
Hemicellulose
C
Cellulose and hemicellulose
D
Peptidoglycan
Answer
Peptidoglycan
Explanation
Solution
Bacterial cell wall is made up of peptidoglycan.It is composed of a long chain of alternating sugar molecules of N-acetylglucosamine NAG and N-acetylmuramic acid NAM.Peptidoglycan layer helps in the protection of the bacteria from osmotic pressure.Gram positive bacteria have a thicker peptidoglycan layer and appear purple when stained.On the other hand, the gram negative bacteria have a thinner peptidoglycan layer.