Biology 9700/04 May June 2006 | Cambridge AS Level Past Papers With Mark Scheme

1. Glycolysis stages, cellular location, and metabolic pathway adaptations under anaerobic conditions, such as fermentation in yeast.
2. Photosynthesis rates under varying light intensities, temperatures, and CO2 concentrations, with implications for commercial crop management.
3. Ultrafiltration mechanisms in kidneys, including glomerular structure, filtrate composition differences, and the role of pressure gradients.
4. Synaptic transmission processes, focusing on neurotransmitters, calcium ion roles, and mechanisms ensuring unidirectional nerve impulse flow.
5. Genetic inheritance patterns in plants, Punnett square applications for dihybrid crosses, and phenotypic ratios for squash fruit traits.
6. Sickle cell allele effects in malaria-endemic regions, detailing health consequences for homozygous dominant and recessive individuals and heterozygote advantages.
7. Homeostasis mechanisms for blood glucose regulation involving insulin, glucagon, and ADH's role in osmoregulation.
8. Natural selection principles in evolution, including examples of mutation impacts on phenotype and adaptive advantages.