Biology 9700/11 May June 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Organelle visibility in stained plant cells using light microscopy, prokaryotic cell structure essentials, and eukaryotic organelle membrane composition.
2. Protein structure levels for enzymatic function, activation energy in enzyme reactions, and factors influencing enzyme activity in experimental trends.
3. Mechanisms of substance transport across membranes, active transport in sugar uptake, and membrane receptor roles in cell signaling.
4. Transpiration effects on tree diameter, mass flow dynamics in sieve tubes, and heart chamber pressure changes during cardiac cycles.
5. Haemoglobin's affinity variations for oxygen, carbon dioxide, and carbon monoxide; cardiovascular impacts of smoking, and cellular observations in immune response activation.
6. Trophic energy flow and productivity calculations in ecosystems; energy losses and herbivore energy transfer proportions.