Biology 9700,23 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Respiratory System & Gas Exchange | Structure, Function, and Blood Flow Regulation – Identifying cartilage in the respiratory system, explaining its role, and describing the sequence of events ensuring efficient blood supply to the lungs.

2. Cell Division & Stem Cell Differentiation | Mitotic Stages and Specialized Cell Functions – Understanding stem cell renewal in the intestinal lining, identifying mitotic stages, and explaining structural adaptations of specialized cells.

3. DNA Structure & Replication | Nucleotide Composition and Antiparallel Strands – Classifying nitrogenous bases, explaining DNA synthesis mechanisms, and describing the role of antiparallel strand orientation in replication.

4. Enzyme Function & Biofuel Production | Enzyme Activity in Polysaccharide Breakdown – Investigating fungal enzyme efficiency, optimizing enzyme use in sugar production, and analyzing hydrolytic enzyme function in plant cell walls.

5. Immune Response & Disease Control | T-Lymphocyte Activation and Vaccination Strategies – Understanding T-cell roles in immune defense, explaining antigen detection, and discussing vaccination strategies for global disease eradication.

6. Microbiology & Pathogenesis | Cholera Infection Mechanism and Cell Membrane Interaction – Explaining bacterial toxin action, membrane receptor binding, ion transport effects, and resulting water loss leading to dehydration.