easy · Enhanced ACT science
A scientist measures the reaction rate of a specific enzyme at varying temperatures and records the following data:
| Temp (^circC) | Reaction Rate (units/min) |
| :--- | :--- |
| 10 | 15 |
| 20 | 35 |
| 30 | 70 |
| 40 | 12 |
Which statement best explains the drastic change in reaction rate observed at 40^circC?
- The rate decreased because there was not enough O₂ to facilitate the reaction.
- Mitochondria stopped producing ATP, causing the enzyme to lose all its energy.
- The reaction reached homeostasis and stabilized the rate to prevent cell damage.
- The enzyme denatured because its protein structure unfolded at high heat.
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