Scientists grew a strip of human muscle tissue that contracted repeatedly to operate a small laboratory pump.
The pump operated at the same rate for one minute in each trial. Glucose was available in excess.
| Trial | Oxygen available | Glucose used in one minute (µmol) |
|---|---|---|
| A | Yes | 0.40 |
| B | No | 6.0 |
Calculate how many times more glucose was used in trial B than in trial A.
Explain why more glucose was needed in trial B to operate the pump at the same rate.
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.