Biology 9700/21 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Structure and bonding in amino acids, peptide bond formation, and electron micrograph analysis of plasma cells.

2. BCG vaccine's role in TB prevention, immunity classification, and mechanisms of rifampicin action and bacterial resistance development.

3. Effects of sucrose concentration on osmosis in potato tissue and water potential concepts.

4. Differences in blood and lymph components, roles of the SAN and AVN in heart coordination, and implications of abnormal pathways on heart rate.

5. Immune response disruptions in myasthenia gravis, enzyme mechanisms, and therapeutic applications of monoclonal antibodies.

6. Role of DNA polymerase in replication, mechanisms of floxuridine in cancer treatment, and the relationship between smoking and lung cancer development.