Biology 9700/02 May June 2006 | Cambridge AS Level Past Papers With Mark Scheme

1. Capillary structure and function: oxygen and glucose diffusion into tissue fluid, red blood cell diameter comparison, and vein vs. capillary wall differences.

2. Phloem transport: sucrose translocation mechanism from leaves to fruit, structural differences between xylem vessels and sieve tubes, and sugar metabolism in non-sweet fruits.

3. Protein synthesis: role of tRNA in ribosome translation, polypeptide formation, and antibody specificity linked to unique binding sites.

4. Chloroplast structure and functions: identification of organelles, amylose and amylopectin synthesis pathways, and vacuole water storage roles.

5. Urease activity: hydrolysis of urea to ammonia, nitrogen availability as nitrates for plants, competitive inhibition by thiourea, and reaction rate analysis.