Biology 9700/42 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Hormonal regulation of ADH release in response to changes in water balance and kidney function in mammals.

2. Natural selection driving armor plate variations in stickleback fish, influenced by environmental pressures and genetic factors.

3. Recombinant DNA technology for producing therapeutic proteins like insulin and calcitonin, emphasizing gene cloning and expression systems.

4. Meiosis comparison with mitosis, focusing on chromosome behavior and gametogenesis roles in humans and plants.

5. Photosynthesis rates in marine autotrophs under varying carbon dioxide concentrations and day lengths, with implications for ocean acidification mitigation.

6. Oxidative phosphorylation processes in mitochondria, detailing electron transfer, proton gradients, and ATP synthesis.