Biology 9700/22 Oct Nov 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Structure-function relationships in gas exchange tissues, mitochondria's role in tissue B, and distribution of tissue C in the respiratory system.

2. Nitrogen cycle processes (ammonification and nitrate uptake), xerophytic adaptations, and xylem transport mechanisms.

3. Closed double circulation in mammals, oxygen transport via hemoglobin, acclimatization at high altitudes, and effects of carbon monoxide on cardiovascular function.

4. Cholera case disparities by economic status, factors affecting vaccine effectiveness, and B-lymphocyte response in immune individuals.

5. Cardiac cycle events: impulse conduction pathways, hydrostatic pressure-driven tissue fluid formation, and comparison of blood and tissue fluid compositions.

6. Agrobacterium tumefaciens' role in plant tumor formation, bacterial mobility within plant tissues, and measurement of cell dimensions in microscopic images.