Biology 9700 Practical Notes -

on the X-axis; Dependent on the Y-axis. Use at least 50% of the grid provided.

Mix sample with ethanol, then add water. Positive result: Cloudy white emulsion. 📉 Core Skill 3: Data Presentation and Analysis

What you keep the same (e.g., temperature, pH). Experimental Errors: Systematic: Faulty equipment (e.g., a thermometer that is 2∘2 raised to the composed with power biology 9700 practical notes

You must know the reagents and the specific color changes for biological molecules. 🍱 The Big Four Tests

Add Biuret reagent. Positive result: Blue → Purple/Violet. on the X-axis; Dependent on the Y-axis

Random: Difficulty in judging a color change (end-point). Use a colorimeter or a standard color chart to improve this. 💡 Quick Tips for Exam Day

The microscope is a staple of the 9700 syllabus. You must be comfortable with both low and high-power lenses. Always remember the formula: Plan Diagrams: Do not draw individual cells. Use clear, sharp, continuous lines. Positive result: Cloudy white emulsion

Join points with straight lines (ruled) unless a "best-fit" line is specifically requested. Circle outliers if they are clearly anomalous. ⚠️ Identifying Variables and Errors You will be asked to critique your experiment. Be specific.