Biology 9700/22 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Structural identification of veins versus arteries, capillary adaptations for exchange, and mitotic versus meiotic roles in epithelial cells.
2. Comparison of keratin and chitin properties with other biomolecules; thermal stability and activity profiles of chitinase enzyme.
3. Plant transport system differences in structure and function, roles of xylem and phloem cells in material transport.
4. Features distinguishing prokaryotic from eukaryotic cells in Staphylococcus aureus, effects of water potential on bacterial cells, and mutation-driven antibiotic resistance mechanisms.
5. Ecological concepts of population and community exemplified by organisms on sloth fur, ecosystem definition based on interactions in microhabitats.
6. Nicotine vaccine mechanisms in inducing immune responses, cardiovascular impacts of nicotine including clot formation and thrombosis risks.