BI-1372
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
A student investigates the effect of temperature on the activity of an enzyme that breaks down starch. At 37 °C, the reaction is fast. At 70 °C, no starch is broken down. Which statement explains the result at 70 °C?
- The enzyme is denatured so the active site changes shape and starch cannot bind.
- The enzyme is frozen so the substrate molecules stop moving completely.
- The enzyme concentration becomes zero so there are no collisions with starch.
- The starch molecules are denatured so they cannot be broken down.
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