Biology 9700/12 Oct Nov 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Methods for determining xylem vessel dimensions using eyepiece graticules and light microscopy.
2. Protein structure's influence on enzyme activity, including competitive and non-competitive inhibition at tertiary levels.
3. Osmosis and water potential relationships in plant cells, with impacts on cell turgidity and plasmolysis.
4. Membrane recognition roles of glycoproteins and glycolipids, alongside active and passive transport processes.
5. Mitosis contributions to growth, repair, and asexual reproduction, focusing on metaphase chromosome arrangements.
6. DNA base pairing consistency across species, Meselson-Stahl's DNA replication experiment, and transcription-translational frameworks.
7. Vascular tissue functions in xylem and phloem, water transport pathways, and companion cell support roles.
8. Gas exchange efficiency in respiratory systems, lung structure adaptations, and impacts of smoking-related toxins.
9. Immune response stages against pathogens, antibody binding regions, and hydrolysis effects on antibody structure.
10. Ecosystem energy flow, trophic levels, and nitrogen cycle processes driven by nitrifying bacteria.