Biology 9700/21 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Organelles in mammalian liver cells with structure and storage roles; glycogen's branched structure and storage efficiency.
2. Aquaporins in Arabidopsis root hairs for water transport, pathways of water from root hair cytoplasm to xylem.
3. Effects of cuticle composition mutation on transpiration rates in Arabidopsis plants under light and dark conditions.
4. DNA replication and mitotic divisions in stem cells; development of blood cells and roles of mitosis in immunity.
5. Arctic food web trophic levels, polar bear population constraints, and ecosystem impacts of Arctic cod overfishing.
6. Mammalian double circulatory system explanations, cardiac cycle pressure variations, and treatments for coronary artery narrowing.