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I’m really stuck on how to approach this lab report for my biology class. The experiment was on enzyme reaction rates, and I recorded all the data, but I’m unsure how to structure the discussion section to properly analyze the unexpected plateau in the graph.

Yeah I had a similar plateau in my own lab writeup. I kept the discussion grounded in what the numbers actually showed: the rate stops increasing beyond a certain substrate level and replicates stay flat. I described the exact region of the plateau, noted how many trials fell into that region, and pointed out that controls showed no such leveling. Then I offered a few plausible explanations in separate sentences instead of one big claim—enzyme saturation, substrate depletion, and instrument floor effects. I avoided pushing one cause too hard and instead framed it as competing hypotheses and how future data could distinguish them.

Second pass I tried to relate the plateau to the growth law we learned before, but the fit looked off. I wasn't sure if I should include a full Michaelis-Menten interpretation or just say that the data hints at a ceiling. I left it kind of hovering, with caveats about assumptions and data range.

Concrete action I took: I reran one replicate with fresh enzyme and used all the same substrate levels to see if the plateau persisted. It did. That pushed me to mention it as a robust feature of the data, not an error. Then I added a limitations sentence about potential enzyme instability over the course of the assay and suggested ways to test it in future work.

I keep worrying maybe the real issue is the way I measured rate. If the assay response time is slower than the reaction, you could get a fake plateau. I didn't have time to test it in depth, so I left that as a possibility rather than a conclusion, which still feels unsatisfying.

One question though: did you have a control where you kept substrate constant and varied anything else to see if the plateau disappears?

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