Which of the following biomolecules is most abundant in plant cell walls?
Show answer & explanation
Correct answer: A
Explanation
Answer: Cellulose
Explanation:
- The plant cell wall is primarily composed of complex carbohydrates.
- Cellulose: This is the most abundant organic polymer found on Earth. It consists of long chains of glucose units and provides structural strength to the cell.
- Role: Microfibrils of cellulose form a mesh-like structure that prevents the cell from rupturing and gives it a definite shape.
Additional Points:
- Pectin: It acts like a 'glue' that binds cells together (found in the cell wall).
- Lignin: Found in woody plants, it provides additional strength and water-resistant properties.
- Hemicellulose: It functions as a cross-link, connecting the cellulose fibers together.
Potential Questions and Answers:
Question 1: What is the cell wall of fungi made of?
Answer: Chitin.
Question 2: Is a cell wall present in animal cells?
Answer: No, animal cells possess only a cell membrane.
Question 3: What is the main function of the cell wall?
Answer: To provide mechanical support to the cell and protect it from external shocks.