Transport across membranes Quiz
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5 questions, one answer each
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1. Which process moves glucose into a cell down its concentration gradient through a carrier protein?
- A. Active transport
- B. Osmosis
- C. Exocytosis
- D. Facilitated diffusion
2. What does ATP do in active transport?
- A. Forms the channel
- B. Provides energy to change the shape of the carrier protein
- C. Carries the ion
- D. Makes the membrane fluid
3. Red blood cells are placed in a solution with a lower concentration of free water molecules than their cytoplasm. What happens?
- A. Water leaves the cells by osmosis and they shrink
- B. Water enters and the cells burst
- C. Ions enter by active transport
- D. Nothing changes
4. Which process allows a phagocyte to take in a bacterium?
- A. Facilitated diffusion
- B. Exocytosis
- C. Endocytosis
- D. Osmosis
5. The uptake rate of a substance levels off at high concentration and falls with a respiratory inhibitor. Which is the most likely process?
- A. Simple diffusion
- B. Osmosis
- C. Facilitated diffusion
- D. Active transport