Biology 9700/43 Oct Nov 2021 | Cambridge AS Level Past Papers With Mark Scheme

- Kidney nephron structure: efferent blood vessel, ADH response cells, podocyte location, medulla cells.
- Proximal convoluted tubule adaptations: microvilli presence, high surface area, numerous mitochondria, selective reabsorption mechanisms.
- ADH concentration trends: correlation with blood water potential changes, physiological implications of low ADH levels on circulation.
- Rubisco activase activity: temperature effects on cotton and false flax, enzymatic differences, implications for crop heat tolerance.
- Ecological surveys: biodiversity measurement techniques, factors affecting Great Britain's biodiversity, species extinction and introduction impacts.
- DNA profiling: PCR necessity for crime scene analysis, electrophoresis role in DNA banding patterns, ethical considerations of genetic data usage.