Polysaccharide cellulose is the building material of:
Correct answer: A. Primary cell wall
- A. Primary cell wall
- B. Secondary cell wall
- C. Middle lamella
- D. Plasma membrane
Explanation
Cellulose is a crucial polysaccharide that forms the structural component of the primary cell wall in plants. It provides tensile strength and rigidity, allowing the plant to maintain its shape. The secondary cell wall, although providing additional support, is not primarily composed of cellulose but rather lignin and other compounds. The middle lamella is mainly composed of pectin and acts as an adhesive between cells. The plasma membrane is not part of the cell wall and does not contain cellulose, as it is primarily made up of lipids and proteins.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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