Biology 9700/52 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Analysis of endoprotease and exoprotease enzyme functions in protein hydrolysis, chromatography for monitoring reaction progress, and standardizing variables in enzymatic investigations.
2. Evaluation of chromatograms to determine enzyme activity differences and peptide movement based on size and charge.
3. Use of electrophoresis and chromatography to differentiate between sickle cell and normal hemoglobin based on amino acid sequences.
4. Aphid infestation studies on hybrid plants; effects of insecticide application to different leaf surfaces, standard error interpretation, and result significance.
5. Statistical methods, including t-tests, for comparing aphid counts post-treatment, null hypothesis formulation, and degrees of freedom calculation for t-test analysis.