Question 1
Paper 2Medium16 marksResearchers cultured equal numbers of the same type of animal cell under identical conditions, supplying a different carbon compound to each group. They measured the rates of ATP synthesis and oxygen uptake.
| Carbon compound supplied | ATP synthesis rate (relative units min⁻¹ per 10⁶ cells) | Oxygen uptake rate (µmol min⁻¹ per 10⁶ cells) |
|---|---|---|
| None added | 2.0 | 1.0 |
| Glucose | 8.0 | 4.0 |
| Fatty acids | 6.0 | 5.0 |
Calculate the percentage increase in ATP synthesis rate when glucose is supplied compared with when no carbon compound is added. Show your calculation.
State which of glucose or fatty acids gives the higher ATP synthesis rate, and state the difference between their rates.
Explain how energy from cell respiration can be transferred to active transport through the interconversion of ATP and ADP.
Distinguish between gas exchange and cell respiration.
A student claims that oxygen uptake is a direct measure of the rate of ATP synthesis. Evaluate this claim using the data, and identify two limitations of the evidence.