Inorganic ions Quiz
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5 questions, one answer each
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1. Which ion forms part of the haem group in haemoglobin?
- A. Na⁺
- B. Fe²⁺
- C. Mg²⁺
- D. H⁺
2. The pH of a cell falls from 7.2 to 6.8. What has happened?
- A. Hydrogen ion concentration has decreased
- B. Hydrogen ion concentration is unchanged
- C. Phosphate ion concentration has decreased
- D. Hydrogen ion concentration has increased
3. In the ileum, glucose enters epithelial cells with sodium ions because:
- A. Sodium ions are used as an energy source
- B. Sodium ions chemically bind to glucose to make it soluble
- C. Sodium ions diffuse in through a co-transporter protein that also carries glucose
- D. Sodium ions pump glucose out of the cell
4. Which two molecules both contain phosphate ions as a component?
- A. DNA and ATP
- B. Haemoglobin and DNA
- C. Glucose and ATP
- D. Haemoglobin and glucose
5. A drug stops the sodium–potassium pump in ileum epithelial cells. Glucose absorption falls because:
- A. Glucose can no longer diffuse
- B. Iron ions bind to the glucose
- C. The pH of the lumen rises
- D. The sodium ion concentration gradient is not maintained