Biology 9700/21 May June 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Mitosis stages and spindle function in plant and animal cells, along with the role of nitrogen fixation in legume roots.
2. Structural adaptations of the gas exchange system and immune response stages in combating bacterial infections.
3. Assimilate transport mechanisms in plants and plasmodesmata adaptations for efficient cellular communication.
4. Enzyme-substrate interaction models, secondary protein structure, and the role of carbonic anhydrase in the blood.
5. Differences in triglyceride and phospholipid structures, packaging, and export of pancreatic enzymes via vesicles.
6. Properties of water enabling biological functions and transcription processes in red blood cell formation.
7. Effects of intercropping legumes and cereals on nitrogen cycle enhancement and agricultural yields.