Biology 9700/33 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. States of plasmolysis in onion cells under varying sodium chloride concentrations; determination of unknown solution concentration by comparing plasmolysis levels.

2. Osmotic effects on red blood cells in sodium chloride solutions; graphical analysis to identify 50% hemolysis concentration.

3. Mixing effects of oil and water with egg yolk as an emulsifier; observations of stabilization of oil-water emulsions.

4. Blood cell morphology differences between red and white blood cells; measurement of crenated red blood cell diameters under high magnification.

5. Structural composition of cell membranes with proteins and lipids; interactions between phospholipids, proteins, and surrounding environments in stabilization and functionality.

6. Observation and recording methods for microscopic studies; preparation of slides, adjustment of light, and maintenance of specimen integrity.

7. Calculation and graphical representation in experimental biology; usage of magnification and metric conversions for accurate cellular measurements.