A student observed a boundary in both plant and animal cells that controls entry and exit of substances. Which of the following structures is likely being observed?
Correct answer: C. Plasma membrane
- A. Mitochondria
- B. Golgi apparatus
- C. Plasma membrane
- D. Cell wall
Explanation
The plasma membrane is present in every cell and is partially permeable, so it decides what enters and leaves, which is exactly the function described. The cell wall is the trap: it is a boundary too, but it occurs only in plants and is fully permeable, so it controls nothing. The words both plant and animal are what rule it out.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Animal and Plant Cell
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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