Biology 9700 Practical Notes -

. These notes cover the core skills and experimental procedures required for the syllabus. 1. Biological Molecule Tests

We can breakdown a for evaluating experimental errors. Share public link

of solution from Tube 1 and transfer it to Tube 2. Mix thoroughly. (Tube 2 is now 5%). cm3c m cubed

). Ensure points are accurate to within half a small square. biology 9700 practical notes

Only draw internal structures if they are visible (e.g., guard cells, chloroplasts, or nuclei). Never draw structures from memory if they cannot be resolved on the slide. 6. Identifying Errors and Suggesting Improvements

When writing a plan (for a 15-mark question), follow this rigid structure:

Initial rate of reaction (e.g., volume of gas produced per minute, or time taken for a substrate solution to turn clear). Biological Molecule Tests We can breakdown a for

Use potato cylinders to determine water potential (

Requires heating in a water bath at 80°C–100°C for 5 minutes. Benedict's + HCl + NaHCO3cap N a cap H cap C cap O sub 3 Brick-Red ppt Remains Blue

You need to make specific concentrations. (Tube 2 is now 5%)

Always use a thermostatically controlled water bath. Controlling pH: Use buffer solutions. D. Diffusion and Osmosis

). Place them in sucrose solutions of different concentrations. Change in mass/length measures water movement.

Factors kept constant to ensure a fair test (e.g., temperature, pH, volume of reagents). You must state how to control them, not just list them. Data Presentation