The middle lamella of the cell wall is composed of:
Correct answer: B. pectin
- A. Cellulose
- B. pectin
- C. Lignin
- D. Murein
Explanation
The middle lamella is made up of pectin in the form of calcium and magnesium pectates. It is present between the primary cell walls of two cells and cements them together.
This question appeared on the ETEA MDCAT 2011 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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