Biology 9700/22 May June 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Identification of plant vs. animal cell structures in electron micrographs, emphasizing organelle differences like chloroplasts and centrioles.

2. Structural defects in congenital heart disease: patent ductus arteriosus, pulmonary stenosis, coarctation of the aorta, and ventricular septal defect, linked to blood flow changes.

3. HIV/AIDS impact on African life expectancy: statistical analysis of HIV prevalence vs. life expectancy, and prevention measures like education and antiretroviral access.

4. Lysozyme protein structures: primary, secondary, and tertiary structure significance, with explanations of mutation effects on function and solubility.

5. Human gas exchange system: structural features like cartilage, cilia, and goblet cells' roles in maintaining airway health and efficient respiration.

6. Galapagos Island food web: energy flow among producers (xerophytes, kelp) and consumers (iguanas, hawks), emphasizing ecosystem dynamics and predator-prey relationships.