Fungal cell wall is composed of —A. ChitinB. Chitin or celluloseC. HemicelluloseD. Cellulose

The correct answer is A. Chitin.

Explanation: Fungal cell walls are primarily composed of chitin, a polysaccharide made up of N-acetylglucosamine units. Chitin provides structural support and rigidity to the fungal cell wall, helping the fungus maintain its shape and protect itself against environmental stresses.

Unlike plant cell walls, which are primarily composed of cellulose, fungal cell walls are distinct in their composition and lack cellulose as a major component. This difference is one of the characteristics used to differentiate fungi from plants.

Here is why the other options are incorrect:

B. Chitin or cellulose: This is incorrect because fungal cell walls do not contain cellulose as a major component. Chitin is the dominant structural molecule in fungi.
C. Hemicellulose: This is incorrect because hemicellulose is mainly found in plant cell walls as a secondary component to cellulose.
D. Cellulose: This is incorrect because cellulose is a key component of plant cell walls, not fungal cell walls.
Hence, the primary and correct answer is A. Chitin.