Biology 9700/22 Oct Nov 2022 | Cambridge AS Level Past Papers With Mark Scheme

- Mammalian circulatory system: closed double circulation, oxygen transport, carbon dioxide transport.
- Human cytomegalovirus (HCMV): viral structure, glycoproteins, double-stranded DNA, virion formation, host cell replication.
- Plasmodium falciparum: malaria pathogen, artemisinin-based combination therapy (ACT), drug resistance, trophozoite stage, kelch13 gene mutations.
- Gas exchange system: epithelium structure, goblet cells, respiratory bronchioles, alveoli differences, transport tissues (xylem, phloem).
- Collagen structure: polypeptide chain, extracellular matrix, collagenase activity regulation, synthetic inhibitors.
- Transport mechanisms: sucrose translocation, companion cells, phloem sieve tube elements, plasmodesmata, cotransporter proteins.