Biology 9700/01 May June 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Structural feature identification in cells, including measurements in appropriate units and comparisons of cellular components like nucleoli and ribosomes.
2. Bonds in protein tertiary structures, glycosidic linkages in carbohydrates, and triglyceride formation emphasizing carbon-to-oxygen ratios.
3. Reaction rate experiments using Benedict's test, catalase oxygen evolution, and lipase activity at optimal pH.
4. Mechanisms of DNA transcription and translation, effects of base mutations in diseases like sickle cell anemia, and DNA replication evidence from nitrogen isotope labeling.
5. Membrane dynamics in the fluid mosaic model, diffusion factors, and osmosis in cell membranes.
6. Immune response variations, such as active versus passive immunity, and lymphocyte roles in graft rejection.
7. Photosynthesis limiting factors, Bohr effect comparisons in oxygen affinity across species, and energy transfer inefficiency in trophic levels.
8. Nitrogen cycle roles in agriculture, highlighting nitrogen fixation, denitrification, and mineral ion addition by legumes in crop rotation.