The student clearly stated the independent variable, which was the concentration of galactose, and the dependent variable, the rate of lactose hydrolysis measured by glucose production. The research question was well-defined, including the method of analysis and the rationale for the chosen techniques. However, the student did not adequately address the background theory related to competitive inhibition, nor did they justify the number of trials conducted, which would have strengthened their investigation. The student effectively identified controlled variables, safety and environmental issues, and provided a detailed methodology, allowing for reproducibility of the experiment. Ethical considerations were not sufficiently addressed, as the student failed to explain the absence of ethical issues in the investigation.
