Transport in cells Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which of the following best defines diffusion?
- A. The net movement of particles from a region of high concentration to a region of low concentration
- B. The movement of water molecules through a partially permeable membrane
- C. The movement of substances against a concentration gradient using energy
- D. The random movement of all particles in all directions at equal rates
2. A student places an animal cell in a hypertonic solution. What will happen to the cell?
- A. The cell will become turgid as water enters by osmosis
- B. The cell will become crenated as water leaves by osmosis
- C. The cell will become plasmolysed as water leaves by osmosis
- D. The cell will lyse as water enters by osmosis
3. Which factor would NOT directly increase the rate of diffusion across a cell membrane?
- A. Increasing the concentration gradient
- B. Increasing the temperature of the solution
- C. Increasing the surface area of the membrane
- D. Decreasing the number of mitochondria in the cell
4. Root hair cells actively transport mineral ions from the soil. Which statement explains why energy from respiration is needed for this process?
- A. The mineral ions move with the concentration gradient, so energy is needed to speed up the process
- B. The mineral ions move against the concentration gradient, requiring energy to pump them across the membrane
- C. Energy is needed to maintain the cell's structure and allow water to enter by osmosis
- D. Respiration produces oxygen which is required to break down the mineral ions
5. A plant cell is placed in pure water and becomes turgid. Then it is transferred to a concentrated salt solution. Predict what will happen and explain why in terms of water potential.
- A. The cell will remain turgid because the salt solution will diffuse into the cell
- B. The cell will become plasmolysed because water will move out by osmosis as the external solution has lower water potential
- C. The cell will lyse because the high salt concentration will burst the cell membrane
- D. The cell will remain turgid because the cell wall will prevent any water loss