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B2: Quiz 4
B2: Quiz 4
1) We are going to be investigating how the rate of reaction for the enzyme amylase is affected by temperature. The enzyme amylase breaks down starch into maltose.
a) We are able to use iodine to test for the presence of starch.
i) What colour is iodine when no starch is present?
ii) What colour does iodine when iodine is present?
We carry out the experiment using the equipment below.
a) We are able to use iodine to test for the presence of starch.
i) What colour is iodine when no starch is present?
ii) What colour does iodine when iodine is present?
We carry out the experiment using the equipment below.
b) Explain how we can use the equipment above to investigate the effect that temperature has on the rate of reaction of amylase. Write quite a lot for this answer.
c) The student completes the experiment and their results are shown in the table below.
c) The student completes the experiment and their results are shown in the table below.
i) For which temperature was the rate of reaction of amylase the greatest? Explain your answer.
ii) When amylase was at 60°C, it did not break down all of the starch by the end of the 5 minutes. Explain why.
d)
i) Explain how we could modify the experiment to investigate the effect that pH has on the rate of reaction for an enzyme. You only need to give the variable that you would change.
ii) Give a few variables that you would need to keep constant when investigating the effect that pH has on the rate of reaction of an enzyme.
ii) When amylase was at 60°C, it did not break down all of the starch by the end of the 5 minutes. Explain why.
d)
i) Explain how we could modify the experiment to investigate the effect that pH has on the rate of reaction for an enzyme. You only need to give the variable that you would change.
ii) Give a few variables that you would need to keep constant when investigating the effect that pH has on the rate of reaction of an enzyme.