Investigating Cell Membrane Permeability (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the name of the purple pigment found in beetroot cells?
What is the name of the purple pigment found in beetroot cells?
Betalain
Which instrument is used to measure the concentration of leaked pigment?
Which instrument is used to measure the concentration of leaked pigment?
Colorimeter
Why must beetroot cubes be rinsed after cutting?
Why must beetroot cubes be rinsed after cutting?
To remove pigment released during cutting
Which colour filter should be used when setting up the colorimeter?
Which colour filter should be used when setting up the colorimeter?
Blue filter
What does a higher absorbance reading indicate?
What does a higher absorbance reading indicate?
Greater membrane permeability
What happens to membrane permeability as temperature increases?
What happens to membrane permeability as temperature increases?
It increases
How does heat affect membrane proteins?
How does heat affect membrane proteins?
Denatures them
How do phospholipids behave at low temperatures?
How do phospholipids behave at low temperatures?
Pack tightly, creating rigid membrane
How does ethanol disrupt the cell membrane?
How does ethanol disrupt the cell membrane?
Dissolves phospholipid components
How long should samples be left to allow pigment leakage?
How long should samples be left to allow pigment leakage?
20 minutes