Biology 9700/35 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Enzyme catalysis study of catalase in yeast, effects of copper sulfate concentration on hydrogen peroxide hydrolysis, and error sources in temperature-based experiments.

2. Use of serial dilution to create copper sulfate gradients, effect of copper ions on enzyme activity, and control experiment setup for validation.

3. Colorimetric analysis for hydrogen peroxide quantification, absorbance data plotted against catalase concentration, and interpretation of reaction kinetics.

4. Plan and detailed drawings of tubular digestive system sections, calibration of eyepiece graticules, and measurement of tissue fold lengths.

5. Comparison of digestive tract tissue layers using annotated diagrams, differences between inner and outer layers, and analysis of organ sections from related systems.