Investigating enzymes (AQA GCSE Biology): Quizzes
📚Quizzes
Practise the questions
15 questions from this quiz
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Practise the questions
15 questions from this quiz
What is an enzyme?
What is an enzyme?
A protein that speeds up reactions
What does amylase break down?
What does amylase break down?
Starch into simple sugars
Why is iodine solution used in the practical?
Why is iodine solution used in the practical?
It changes colour when starch is present
What is the function of buffer solutions in this experiment?
What is the function of buffer solutions in this experiment?
Keep the pH steady
What is the first step in the practical?
What is the first step in the practical?
Add iodine to each well in the spotting tile
How much amylase solution is used in the test tube?
How much amylase solution is used in the test tube?
2 cm³
How often should you transfer a drop to the spotting tile?
How often should you transfer a drop to the spotting tile?
Every 30 seconds
When should you stop the experiment?
When should you stop the experiment?
When iodine stops changing colour
What is the formula for rate of reaction?
What is the formula for rate of reaction?
If a reaction takes 200 seconds, what is the rate?
If a reaction takes 200 seconds, what is the rate?
0.005 /s
What does the optimum pH mean?
What does the optimum pH mean?
pH that gives greatest rate of reaction
What does a short reaction time indicate?
What does a short reaction time indicate?
Enzyme working well
What should be on the vertical axis of the graph?
What should be on the vertical axis of the graph?
Rate of reaction
Why must all solutions be kept at the same temperature?
Why must all solutions be kept at the same temperature?
Temperature affects enzyme activity
Why are spotting tiles used in this practical?
Why are spotting tiles used in this practical?
Test small samples without affecting reaction