Biology 9700/34 Oct Nov 2023 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of amylase activity on starch hydrolysis, using iodine to determine reaction end-point and varying enzyme concentrations.

2. Proportional dilution preparation for enzyme concentration adjustments, and estimation of unknown amylase concentration through comparative reaction times.

3. Identification of independent variables and control of procedural errors for increased experimental accuracy.

4. Impact of substrate concentration and enzyme inhibitors on reaction rates, with data analysis to differentiate between competitive and non-competitive inhibition.

5. Comparative analysis of leaf structure using stained transverse sections, focusing on tissue arrangement and observable differences.

6. Calibration of an eyepiece graticule using a stage micrometer for accurate measurement of leaf midrib thickness.