The graph shows the rate of an enzyme-controlled reaction at 10, 20, 30, 40 and 60 °C, with peak activity at 40 °C. Which statement is a valid conclusion?
Answer and explanation
Correct answer: A. The optimum temperature is around 40 °C
- Step 1: Find the highest rate.
- Step 2: The peak lies at about 40 °C, which is the optimum.
Answer
The optimum temperature is around 40 °C.
Why not the others: The enzyme is destroyed at 20 °C: activity is lower at 20 °C because molecules move more slowly. The reaction stops at 30 °C: it is still active at 30 °C. The enzyme works best at 60 °C: activity has fallen by 60 °C due to denaturation.
Practise more Skills and Applying Knowledge.
Free questions with an explanation for every one, and full timed National 5 (Scotland) mock tests.
More Skills and Applying Knowledge questions
- A scientist records the dry mass of seedlings grown with and without fertiliser. Which is the dependent variable?
- Why is a control experiment included in an investigation?
- Repeating an experiment several times and calculating a mean improves what?
- The table shows the mass of a potato cylinder in different salt solutions. The mass change is +4% at 0.0 M, 0% at 0.2 M, and −6% at 0.4 M. A…
- A cell has a mass of 4 µg and divides by mitosis. Its two daughter cells each have a mass of 2 µg. A new cell grows to a mass of 4 µg before…
- A section of DNA has 30% adenine. What percentage of the bases are guanine?