Active Transport Quiz
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5 questions, one answer each
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1. What is the key difference between active transport and diffusion?
- A. Active transport moves particles against a concentration gradient and requires energy from respiration
- B. Active transport only works for large molecules whilst diffusion works for all particles
- C. Active transport is faster than diffusion because it uses carrier proteins
- D. Active transport moves particles down a concentration gradient without using energy
2. Which of the following is an example of active transport occurring in plants?
- A. Water moving into root hair cells from the soil
- B. Mineral ions being absorbed by root hairs from the soil against a concentration gradient
- C. Glucose diffusing from cells with high concentration to cells with low concentration
- D. Oxygen entering leaf cells through stomata
3. Why is energy from respiration essential for active transport to occur?
- A. It provides ATP which is needed to move particles against a concentration gradient
- B. It increases the temperature of the cell membrane to help particles move faster
- C. It produces glucose which can be transported instead of other molecules
- D. It breaks down the cell membrane to allow particles to pass through
4. What is the role of protein carriers in active transport?
- A. They create holes in the cell membrane to allow particles to pass through
- B. They bind to molecules or ions and move them across the membrane against a concentration gradient
- C. They produce the energy needed for active transport to occur
- D. They prevent unwanted particles from entering the cell
5. A plant cell is placed in a solution with a very low concentration of mineral ions. The cell's vacuole already contains a high concentration of mineral ions. Explain why the cell cannot simply rely on diffusion to maintain this difference.
- A. Diffusion would move ions out of the vacuole down the concentration gradient, so active transport is needed to move ions in against the gradient
- B. Diffusion only works for water molecules, not mineral ions
- C. The cell membrane is impermeable to mineral ions, so only active transport can move them
- D. Diffusion requires energy from respiration, which is why active transport is more efficient