Lipids
Name: _________________________
1. The diagram shows a triglyceride molecule.
a) Name part A. ____________________________
b) With reference to the labelled part on the diagram, explain the difference between the terms:
 Triglyceride and phospholipid
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
Saturated and unsaturated.
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2. Describe how phospholipid molecules are arranged in a plasma membrane.
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3.
a) How many molecules are produced when a triglyceride molecule is completely hydrolysed.
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b) Many large biological molecules are polymers.
i)
What is a polymer
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ii)
Explain why triglycerides are not polymers.
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c) Molecules can be represented in different ways. The figure below shows a model of a fatty
acid. It shows the different atoms that make up the molecule.
i)
Complete the diagram by naming the atoms labelled A and B.
A: _______________________________
B: _______________________________
ii)
This molecule is a saturated fatty acid. Explain the meaning of saturated.
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4.
a) What type of lipid is cholesterol? ______________________________
b) Explain the function of cholesterol in the plasma membrane.
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c) How is cholesterol transported around the body?
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d) A build-up of one of these transporters in the wall of blood vessels leads to a disease. What is
the name of this disease?
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