Biology 9700/53 May June 2021 | Cambridge AS Level Past Papers With Mark Scheme

- Enzyme catechol oxidase, substrate catechol, product melanin, colorimetric analysis, absorbance measurement.
- Effect of substrate concentration on enzyme activity, independent variable: catechol concentration, dependent variable: absorbance.
- Inhibitor Y, non-competitive inhibition, method for data collection, varying catechol concentrations.
- Chi-squared test application, null hypothesis formulation, observed vs. expected phenotype ratios.
- Critical value usage in statistical analysis, degrees of freedom, significance levels.
- Inheritance patterns in Drosophila melanogaster, gene interaction, phenotypic ratios, genetic analysis.