A Level Biology Practice Exam

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Master the A Level Biology Exam. Use flashcards and multiple choice questions with hints and explanations to ace your test. Start your journey to excellence!

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What is the function of the cell wall in certain cell types?

To control cell signaling
To provide structural support and protection
To facilitate nutrient absorption
To synthesize proteins

The correct answer is: To provide structural support and protection

The cell wall plays a crucial role in providing structural support and protection to certain cell types, particularly in plants, fungi, and some bacteria. It is a rigid outer layer that surrounds the cell membrane, giving the cell its shape and preventing mechanical damage. By maintaining turgor pressure, the cell wall helps plants stand upright against the force of gravity, enabling them to access sunlight effectively for photosynthesis. Additionally, the cell wall acts as a protective barrier against pathogens and physical stressors, which is vital for the survival of these cells in their environments. It is composed of complex carbohydrates like cellulose in plants, chitin in fungi, and peptidoglycan in bacteria, each contributing to its strength and functionality. This structural integrity is essential for the overall health and function of the organism.