Cell walls are made of which substance?

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

Cell walls are made of which substance?

Explanation:
Cell walls are made mainly of cellulose, a long carbohydrate built from glucose units. This polymer forms strong fibrous microfibrils that give plant cells their shape and rigidity, helping them stay upright and withstand internal pressure. Chitin is used in fungal walls and some animal structures, lignin adds extra stiffness in woody tissues but isn’t the primary wall material for most plant cells, and proteins are present in walls but do not provide the main structural framework.

Cell walls are made mainly of cellulose, a long carbohydrate built from glucose units. This polymer forms strong fibrous microfibrils that give plant cells their shape and rigidity, helping them stay upright and withstand internal pressure. Chitin is used in fungal walls and some animal structures, lignin adds extra stiffness in woody tissues but isn’t the primary wall material for most plant cells, and proteins are present in walls but do not provide the main structural framework.

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