Exam (elaborations)
MERGED ACTUAL OCR 2024 OCR A Level Biology A May-June 2024 Question Paper 1 WITH MARK SCHEME
MERGED ACTUAL OCR 2024 OCR A Level Biology A May-June 2024 Question Paper 1 WITH MARK SCHEME
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JUNE 2024OCR
A/AS LEVEL
PASTPAPER
WITH
MARKSCHEME
Turn over
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, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 Which statement about lipids is correct?
A Lipids are polar molecules.
B Lipids that contain fatty acids with carbon–carbon double bonds are liquid at room
temperature.
C Saturated fatty acids, which are present in some lipids, contain carbon–carbon double
bonds.
D The presence of carbon–carbon double bonds in fatty acids allows lipids to pack more
closely together.
Your answer [1]
2 Lipids, polysaccharides, nucleic acids and proteins are all macromolecules.
Which statement about macromolecules is correct?
A All macromolecules are formed in hydrolysis reactions.
B Lipids are not polymers, but polysaccharides, nucleic acids and proteins are polymers.
C Lipids are polymers of fatty acids and glycerol.
D Macromolecules all consist of repeating units of monomers.
Your answer [1]
© OCR 2024
000134
, 3
3 The diagram shows part of a plasma membrane.
X
How can molecule X be described?
A It has a hydrophilic head and a hydrophobic tail.
B It is formed when the glycerol in a triglyceride is replaced by a phosphate.
C It is non-polar.
D The tails are joined to the head by peptide bonds.
Your answer [1]
4 Which statement describes a feature of plasma membranes?
A Channel proteins are a type of intrinsic protein.
B Glycolipids are intrinsic proteins that have lipid molecules attached.
C Phospholipids form a rigid bilayer that membrane proteins are attached to.
D The plasma membrane forms an impermeable barrier.
Your answer [1]
© OCR 2024 Turn over
000135
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