Question

Gram-negative and Gram-positive bacteria have cell membrane made up of: 

A

Peptidoglycan

B

Cellulose

C

Fats

D

Chitin

Medium

Solution

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Correct option is
A

Peptidoglycan

  • The cell wall of Gram-positive bacteria contains a thick peptidoglycan layer with teichoic acids. It can retain the gram stain and the bacteria appear purple because the thick layer of peptidoglycan traps the stain. 
  • The cell of Gram-negative bacteria contains a thin peptidoglycan layer without teichoic acids. Gram-negative bacteria appear bright pink or red because they have only a thin peptidoglycan layer sandwiched between two lipid layers.
  • Cellulose is the major component of the cell wall of the plant. It provides strength and rigidity to the cell.
  • Fats in the form of lipids form an integral component of the plasma membrane where it forms a bilayer.
  • Chitin provides an integral component of the cell wall of fungi. It is a long-chain polymer of N-acetylglucosamine. It is the second most abundant homopolysaccharide.
So, the correct answer is option A.

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