Biology 9700/34 May June 2021 | Cambridge AS Level Past Papers With Mark Scheme
- Investigation of catalase activity in yeast cells through pH effects.
- Measurement of oxygen release from hydrogen peroxide breakdown.
- Use of various pH buffers (3, 4, 5, 6, 7) for experimental conditions.
- Recording time taken for mixture to travel specific distances (5 cm to 15 cm).
- Identification of dependent variable: time for reaction completion.
- Suggestion of control measures to ensure experimental accuracy.

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