Biology 9700/23 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme
- Human gas exchange system structure, parts identification, and functions.
- Effects of tobacco smoke on health, including mutagens, blood pressure, and mucus production.
- Leaf transport tissues, mesophyll cells, and phloem sieve tube elements functions and adaptations.
- Stem cell characteristics in Caenorhabditis elegans, interphase phases, and mitosis stages.
- Antibiotic sensitivity testing, bacterial response to antibiotics, and vaccine versus antibiotic use.
- Collagen structure, glycine's role, collagenase action, and pH effects on enzyme activity.

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