Comparative cell structure: Plants possess which structural feature that animals lack? Context: Consider the outer covering beyond the plasma membrane in plant cells. Choose the correct structure.

Difficulty: Easy

A rigid cell wall (cellulose-based)
Centrosomes with centrioles
Lysosomes
Mitochondria

Correct Answer: A rigid cell wall (cellulose-based)

Explanation:

Concept / Approach
Plant cells have a cell wall (primarily cellulose, hemicellulose, pectin) outside the plasma membrane, providing rigidity and shape. Typical animal cells lack a cell wall.

Why others are incorrect
Mitochondria and lysosomes occur in animals; centrosomes with centrioles are characteristic of many animal cells, not plant cells.

Final Answer
A rigid cell wall is present in plants and absent in animals.

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