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Questions and Answers
What is the primary role of a cell wall?
What is the primary role of a cell wall?
- Supplying water to the cell
- Providing energy to the cell
- Facilitating cell division
- Providing structural support and protection (correct)
Which organisms commonly have cell walls?
Which organisms commonly have cell walls?
- Animals
- Marine mammals
- Plants, fungi, and algae (correct)
- Insects and arachnids
What is the primary component of the primary cell wall in land plants?
What is the primary component of the primary cell wall in land plants?
- Cellulose, hemicelluloses, and pectin (correct)
- Lignin and suberin
- Glycoproteins and agar
- Starch
What is the composition of bacterial cell walls?
What is the composition of bacterial cell walls?
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Which organism possesses a cell wall composed of chitin?
Which organism possesses a cell wall composed of chitin?
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Study Notes
Role of Cell Wall
- Provides structural support and rigidity to the cell.
- Protects against mechanical stress and environmental factors.
- Maintains cell shape and prevents excessive water intake.
Organisms with Cell Walls
- Commonly found in plants, fungi, and many prokaryotes (e.g., bacteria).
- Animals do not possess cell walls, relying instead on a flexible cell membrane.
Primary Component of Plant Cell Walls
- Composed mainly of cellulose, a carbohydrate polymer.
- Cellulose fibers contribute to strength and integrity of the cell wall structure.
Composition of Bacterial Cell Walls
- Typically contain peptidoglycan, a polymer consisting of sugars and amino acids.
- Variations in structure lead to classifications into Gram-positive and Gram-negative bacteria.
Organisms with Chitin Cell Walls
- Fungi are characterized by cell walls composed of chitin.
- Chitin is a tough polysaccharide providing strength and protection.
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