Biology 9700/42 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. The link reaction in cellular respiration, involving pyruvate decarboxylation and reduced NAD oxidation.

2. Plastid transformation effects on photosynthesis in etioplasts and chromoplasts, pigment extraction using chromatography.

3. Sliding filament model implications of sarcomere contraction, ATP role in muscle contraction, and GSDV metabolic impacts.

4. Herbicide resistance evolution in weeds, ALS inhibitor mechanisms, and genetic modification in crop resistance.

5. BRCA2 mutations linked to cancer risk, microarray applications in genetic screening, and ethical implications of genetic testing.

6. Selective reabsorption in proximal convoluted tubule, osmoregulatory role of ADH, and feedback mechanisms maintaining water potential.