Biology 9700/21 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Identifying eukaryotic cell structures: organelles with 70S ribosomes, DNA-histone complexes, Golgi apparatus, nucleolus.

2. Differences in cell wall composition: prokaryotic (peptidoglycan) versus plant cell walls (cellulose).

3. Km derivation and enzyme-inhibitor kinetics for phosphatases, explaining Vmax and Km changes with competitive inhibitors.

4. Antibody structure: variable and constant regions related to antigen specificity and immune response mechanisms.

5. DNA replication versus transcription processes; telomere and ribosome functions in genetic and protein synthesis.

6. Mechanisms of sucrose transport in phloem: H⁺ ion gradients, co-transport with companion cells, and identification of sink tissues.

7. Cholera pathology: choleragen binding to gangliosides, its cellular effects, and antibiotic use recommendations for severe cases.