Enzymes & Metabolism (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Which enzyme is used to break down starch in the practical investigating pH effects?
Which enzyme is used to break down starch in the practical investigating pH effects?
Amylase
What is the substrate being broken down by amylase in this investigation?
What is the substrate being broken down by amylase in this investigation?
Starch
What product is formed when amylase breaks down starch?
What product is formed when amylase breaks down starch?
Maltose
Which chemical is used as an indicator to test for the presence of starch?
Which chemical is used as an indicator to test for the presence of starch?
Iodine
What colour does iodine turn when starch is present?
What colour does iodine turn when starch is present?
Blue-black
What colour does iodine remain when starch has been completely broken down?
What colour does iodine remain when starch has been completely broken down?
Brown
What is the independent variable in this enzyme investigation?
What is the independent variable in this enzyme investigation?
pH (buffer solution)
Which equation is used to calculate the rate in this practical?
Which equation is used to calculate the rate in this practical?
Which variable must be controlled when investigating the effect of pH on enzyme activity?
Which variable must be controlled when investigating the effect of pH on enzyme activity?
Temperature
What equipment is used to hold the drops of iodine for testing?
What equipment is used to hold the drops of iodine for testing?
Spotting tile
What equation calculates rate when measuring product formation over time?
What equation calculates rate when measuring product formation over time?
Why are drops of solution taken at regular intervals during the experiment?
Why are drops of solution taken at regular intervals during the experiment?
To test when starch has been broken down