Consider the following statements regarding cell wall composition :
- Bacterial cell wall is made of peptidoglycan.
- Fungal cell wall is made of cellulose.
- Animals lack cell wall and have extracellular matrix made up of sugar and proteins.
Select the correct answer using the code given below :
2 only
1 and 2
1 and 3
1, 2 and 3
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2023
Statement 1 is correct. The cell wall of most bacteria is primarily composed of peptidoglycan, a polymer consisting of sugars and amino acids, which provides structural support and protection. Statement 2 is incorrect. Fungal cell walls are mainly composed of chitin, a tough polysaccharide, although other components like glucans are also present. Plant cell walls are made of cellulose. Statement 3 is correct. Animal cells do not possess a rigid cell wall. Instead, animal tissues have an extracellular matrix (ECM) which is a complex network of secreted molecules, including various proteins (like collagen, elastin) and glycoproteins (like proteoglycans, which are composed of protein and carbohydrate chains), providing support, adhesion, and signaling functions.