Required practical - Investigating enzymes (AQA GCSE Biology Combined Science): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does this practical investigate?
What does this practical investigate?
Effect of pH on amylase activity
What does the enzyme amylase do?
What does the enzyme amylase do?
Breaks down starch into simple sugars
How much of each solution should be added to the test tube?
How much of each solution should be added to the test tube?
2 cm³ of each solution
How often should you test a drop on the spotting tile?
How often should you test a drop on the spotting tile?
Every 30 seconds
What indicates that all the starch has been digested?
What indicates that all the starch has been digested?
Iodine no longer changes colour
What is the purpose of buffer solutions in this experiment?
What is the purpose of buffer solutions in this experiment?
To keep pH steady during experiment
What is the formula for calculating rate of reaction?
What is the formula for calculating rate of reaction?
Rate =
If a reaction takes 200 seconds, what is the rate of reaction in s⁻¹?
If a reaction takes 200 seconds, what is the rate of reaction in s⁻¹?
0.005 s⁻¹
What is meant by the optimum pH?
What is meant by the optimum pH?
Where the rate is highest
Why must temperature be controlled in this experiment?
Why must temperature be controlled in this experiment?
So rate changes are only due to pH