A biology undergraduate has completed an enzyme kinetics experiment. His results show a reaction rate that is 30% lower than the theoretical value at the same substrate concentration. He asks AI to write the discussion section. What comes back explains what enzyme kinetics is, describes the Michaelis-Menten model accurately, and ends with a general note that “experimental error may account for discrepancies between theoretical and observed values.” His lab instructor marks the discussion as unsatisfactory: it describes the theory but does not interpret the specific discrepancy, identify possible causes, evaluate which cause is most likely given his experimental setup, or reflect on what the finding means for his understanding of the experiment. AI wrote about enzymes. He needed help interpreting this experiment.
Why AI Lab Report Discussions Stay Generic
The discussion section of a lab report is not a continuation of the introduction. It is the section where the student connects their specific results back to their specific hypothesis and interprets what those results mean. That interpretation requires knowing three things AI does not have access to without a brief: the original hypothesis, what the results actually showed in specific terms, and what the experimental conditions were that might explain any discrepancy. Without those inputs, AI defaults to explaining the scientific concept behind the experiment rather than interpreting the experiment’s outcome. The discussion becomes a literature summary dressed in the student’s experimental context — which is almost never what the rubric is looking for.
What a Lab Report Discussion Brief Needs
A discussion brief requires the original hypothesis stated precisely, the key results stated as specific numbers or observations, and a description of any notable discrepancies between expected and observed results. The brief should also include the experimental conditions that are relevant to interpreting those discrepancies — sources of error that are specific to this lab setup, not just generic acknowledgments that “human error may be a factor.” Was the substrate concentration prepared manually? Was incubation time subject to variation? Were there equipment calibration issues? The sources of error that matter are the ones that could specifically explain the gap between expected and observed. Finally, the brief should note the significance the instructor is looking for: is this lab graded on scientific reasoning, on writing quality, on the student’s ability to connect results to the broader course concepts?
What a Properly Briefed Lab Report Discussion Looks Like
Role: You are helping an undergraduate biology student write the
discussion section of a lab report on enzyme kinetics.
Experiment: Measuring reaction rate of amylase at varying substrate
concentrations to construct a Michaelis-Menten curve.
Hypothesis: Reaction rate would increase proportionally with substrate
concentration up to a saturation point consistent with published Km
values for salivary amylase (~1.5 mM maltose).
Key results: Observed reaction rates were approximately 30% lower than
expected at all concentrations above 1.0 mM. The curve shape followed
the expected Michaelis-Menten pattern but was compressed downward.
What the discussion must do:
1. State whether the hypothesis was supported (it was, in shape, but
not in magnitude — explain the distinction).
2. Interpret the 30% discrepancy specifically — not "experimental error"
generically, but identify which aspects of the experimental procedure
(substrate solution preparation, incubation temperature variance,
spectrophotometer calibration) are most likely to have caused a
systematic underestimation of reaction rate.
3. Evaluate which source is most likely given the specific conditions.
4. Connect the finding to the Michaelis-Menten model — what does the
shape of the curve confirm even if the magnitude was off?
Tone: Scientific, third person, formal register. No first person.The discussion from this brief interprets this experiment — it says something specific about what the results mean and why the discrepancy most likely occurred. It demonstrates the scientific reasoning the lab grade is looking for.
Results Without Interpretation Are Data, Not Learning
The discussion section is where a lab report becomes evidence of learning rather than evidence of completing a procedure. The interpretation — making a reasoned claim about why results look the way they do and what that means — is the intellectual work the section is designed to assess. AI can do that work, but only if the brief contains the specific results, the specific discrepancy, and the specific experimental conditions that make interpretation possible. For students writing lab reports across multiple science courses, Briefing Fox structures the brief so the hypothesis, results, and experimental context are captured before any discussion section is drafted.
Before Your Next Lab Report
Before asking AI to write your discussion section, write down three things: your original hypothesis in one sentence, your key results as specific numbers or observations, and the one discrepancy or unexpected finding that most needs interpretation. Brief AI with those before you describe the experiment. The discussion that earns full marks is the one that interprets your specific results, not the one that explains the science behind them. Try Briefing Fox free at www.briefingfox.com.
Because it doesn’t have your specific results, your hypothesis, or your experimental conditions. Without those, AI explains the underlying science rather than interpreting what your particular experiment produced — which is what a lab discussion section is actually for.
Your original hypothesis, your key results as specific numbers or observations, the most significant discrepancy between expected and observed results, and the specific experimental conditions that could explain that discrepancy. These inputs make interpretation possible.
Explaining the science describes how the process works in general. Interpreting the experiment says what your specific results mean, why they match or differ from expectations, and what the most likely cause of any discrepancy is given your specific setup.
Think through each step of your procedure and ask which one was most subject to variation or human error. Be specific — “the substrate concentration was prepared manually and may have been slightly off” is more useful than “there may have been experimental error.”