Biology 9700/03 Oct Nov 2005 | Cambridge AS Level Past Papers With Mark Scheme

1. Enzyme activity study: hydrolysis of starch by amylase solutions of varying concentrations, reaction time measurement, and reaction rate calculation.

2. Amylase concentration effects on starch hydrolysis: plotting concentration vs. reaction rate and interpreting trends in enzyme kinetics.

3. Experimental modifications: testing temperature effects on enzyme activity using temperature-controlled setups and standardized conditions.

4. Liver cell analysis: high-power drawing of hepatocytes, measurement of nuclear diameter using an eyepiece graticule, and calculation of mean values.

5. Electron micrograph observations: identification of liver-specific structures like mitochondria and rough endoplasmic reticulum not visible under light microscopy, linked to resolution differences.