medium · Enhanced ACT science
In an enzyme experiment, the rate of product formation (in μ mol/min) was measured at five substrate concentrations, at both 25°C and 37°C:
| Substrate (mM) | Rate 25°C | Rate 37°C |
|:---|:---|:---|
| 2 | 8 | 14 |
| 4 | 14 | 24 |
| 8 | 21 | 38 |
| 16 | 25 | 47 |
| 32 | 26 | 49 |
A student claims that doubling substrate concentration always at least doubles the reaction rate. Do the data support this claim?
- Yes, since every rate value recorded at 37 degrees Celsius is larger than the matching value seen at 25 degrees.
- No, because at higher substrate concentrations the rate increases by progressively smaller amounts and levels off.
- Yes, because the measured reaction rate rises every single time the substrate concentration is raised any further at all.
- No, because the reaction rate clearly and steadily decreases once substrate concentration rises past 16 mM in this trial.
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