Biology 9700/04 May June 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Respiratory quotient (RQ) analysis: calculation for linoleic acid metabolism, RQ changes in hummingbirds post-feeding, and temperature effects on butterfly respiration.

2. Hormonal regulation: secretion sites for oestrogen and progesterone, contraceptive mechanisms of combined oral pills, and societal impacts of contraceptive use.

3. Conservation biology: human-induced endangerment of African elephants, adaptive advantages of meerkats reducing extinction risk.

4. Plant anatomy and pest resistance: maize fruit structure functions, acetylcholinesterase inhibition by insecticides, and mutation-driven resistance in corn earworms.

5. Industrial microbiology: penicillin production in batch vs. continuous culture, impact of pH control on penicillin yield, and selective bacterial inhibition by penicillin.

6. Genetic engineering: insulin production using recombinant DNA, plasmid vector design, and antibiotic resistance marker alternatives in gene technology.

7. Genetic inheritance: monohybrid inheritance of horse coat colors, palomino phenotype determination, and genetic diagramming for allele combinations.

8. Photosynthesis mechanisms: light-dependent reactions, roles of reduced NADP in light-independent stages, and stoma regulation for gas exchange.