Biology 9700/35 Oct Nov 2022 | Cambridge AS Level Past Papers With Mark Scheme

- Yeast cells, enzyme catalase, hydrogen peroxide breakdown, oxygen release, substrate concentration effect.
- Immobilization of yeast in sodium alginate beads, bead rising as oxygen released, experimental setup.
- Serial dilution of hydrogen peroxide, concentration preparation, volume transfer, concentration labeling.
- Timing bead rise in hydrogen peroxide solutions, recording results, significant error identification, improvement suggestions.
- Estimation of unknown hydrogen peroxide concentration, experimental results comparison, concentration calculation.
- Investigation of temperature effect on catalase activity, modification of procedure, impact of bead diameter on lactose hydrolysis.