Biology 9700/34 May June 2023 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of protein concentration in milk using serial dilutions and biuret reaction, observing color changes to determine protein levels.

2. Comparative analysis of protein content in cow and plant-based milk varieties, emphasizing quantitative representation through bar charts.

3. Lactase activity evaluation, assessing lactose conversion to glucose and galactose, with varying enzyme concentrations and reaction rates calculated.

4. Microscope calibration and measurement using stage micrometer and eyepiece graticule, applying results to biological structures like plant stem trichomes.

5. Analysis of structural differences in plant stems through plan diagrams and microscopic observations, identifying tissue organization and vascular structures.

6. Methodological improvements and error reduction strategies for biochemical assays and microscopic measurements, enhancing accuracy and reliability.