Biology 9700/52 Oct Nov 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating lactase activity at different pH values using glucose biosensors to measure reaction rates and determine Km.

2. Preparing lactose solutions through proportional dilution for enzymatic activity experiments.

3. Sketching Michaelis-Menten graphs to estimate Km values and identify optimal pH for lactase activity.

4. Analyzing salinity tolerance in crops by measuring yield reductions at various salt concentrations, focusing on monocotyledon and dicotyledon crops.

5. Validating agricultural recommendations based on saline irrigation, addressing discrepancies in expected versus actual yields.