Biology 9700/01 Oct Nov 2007 | Cambridge AS Level Past Papers With Mark Scheme

1. Structural analysis of membranes using electron micrographs, emphasizing measurement accuracy and molecular composition.
2. Differentiation of light and electron microscopy capabilities in resolving cellular details like Golgi apparatus, nuclear envelopes, and chloroplast grana.
3. Osmotic behavior in plant cells under sucrose solutions, focusing on water potential and turgidity changes.
4. Facilitated diffusion limitations compared to simple diffusion due to protein channel availability in membranes.
5. Cancer cell proliferation linked to uncontrolled mitosis and its implications for cell division regulation.
6. Photosynthetic energy flow calculations in ecosystems, focusing on net and gross productivity, respiration losses, and herbivore energy transfer.
7. Antibiotic effects on bacterial protein synthesis, targeting transcription, translation, and ribosomal interactions.
8. Hemoglobin oxygen-binding capacity analysis based on structural components like heme groups and iron atoms.
9. Human respiratory and circulatory system adaptations to altitude changes, including red blood cell count effects on oxygen transport.
10. Epidemiological studies linking smoking to lung cancer through population data analysis and experimental models.