Biology 9700/53 Oct Nov 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of yeast respiration rates using methylene blue as an indicator; optimization of conditions for yeast activity including temperature and substrate type.

2. Analysis of yeast's ability to metabolize monosaccharides (glucose, fructose) and disaccharides (sucrose, maltose, lactose), highlighting differences in carbon dioxide production.

3. Hypothesis testing for yeast growth, comparing cell populations in glucose vs. fructose conditions, with standard deviation and error calculations to validate results.

4. Nicotine's impact on memory test performance in smokers: effects on reaction time and accuracy, controlled variables like abstinence period and test setup.

5. Statistical evaluation of memory test results correlating nicotine levels with cognitive performance, discussing supportive and contradictory trends in data.