Monday 13 May 2024 – Morning
AS Level Biology B (Advancing Biology)
H022/01 Foundations of biology
Time allowed: 1 hour 30 minutes
Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer for each question in the box provided.
1 Which statement about the fatty acids found in lipids is correct?
A They contain only carbon and hydrogen atoms.
B One fatty acid joins with three glycerol molecules to form a triglyceride.
C Saturated fatty acids contain C=C double bonds.
D The ‘tails’ of fatty acids are hydrophobic.
Your answer [1]
2 A group of students were testing plant extracts for biological molecules.
The table shows the colour of each solution before and after testing the extracts.
Colour of Benedict’s Colour of biuret Colour of iodine / KI
Extract solution reagent solution
Before After Before After Before After
A Blue Blue Blue Blue Yellow Blue-black
B Blue Green Blue Blue Yellow Blue-black
C Blue Orange Blue Blue Yellow Yellow
D Blue Orange Blue Violet Yellow Yellow
Which of the plant extracts contained both glucose and amylose but did not contain any protein?
A A large amount of heat energy is required to change the temperature of water.
B The forces of attraction between water molecules are hydrogen bonds.
C Water can dissolve ionic compounds.
D Water is a non-polar molecule.
Your answer [1]
4 A person weighing 75 kg contains 45 dm3 of body fluid.
Approximately 70% of this body fluid is contained within cells as intracellular fluid.
Researchers investigating the effects of water content on cell metabolism concluded that
metabolic activity is significantly inhibited when ~20% of its intracellular fluid has been lost.
Which option shows the volume of intracellular fluid at which metabolic activity of cells in this
person would be significantly inhibited?
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