Active transport and co-transport Quiz
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5 questions, one answer each
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1. Which statement about active transport is correct?
- A. It moves substances down a concentration gradient
- B. It needs ATP and carrier proteins
- C. It occurs through phospholipids only
- D. It stops when ATP is plentiful
2. What is the role of ATP hydrolysis in active transport?
- A. It releases energy and a phosphate group that changes the shape of the carrier protein
- B. It joins glucose to the carrier protein
- C. It creates a concentration gradient by diffusion
- D. It makes the membrane more fluid
3. In the ileum, where is the sodium-potassium pump found?
- A. In the membrane of the epithelial cell next to the lumen only
- B. In the lumen
- C. In the nucleus of the epithelial cell
- D. In the membrane of the epithelial cell next to the blood
4. Glucose enters an ileum epithelial cell by:
- A. Osmosis
- B. Simple diffusion through the phospholipids
- C. Pinocytosis only
- D. Co-transport with sodium ions
5. Cyanide stops respiration. It reduces the uptake of nitrate ions into root cells because:
- A. Nitrate ions cannot dissolve in water
- B. The concentration gradient increases
- C. Cell walls are destroyed
- D. Less ATP is available for carrier proteins to change shape