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Summary AQA A Level Biology Unit 1 notes- lipids

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Module
Unit 1 - Biological molecules

Institution
AQA

Notes on the lipids sub-topic within AQA A Level Biology Unit 1- Biological Molecules. These notes contain sub headings with different methods of note taking like tables, images from online videos and concise bullet points.

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Uploaded on September 7, 2024
Number of pages 10
Written in 2024/2025
Type Summary

lipids
biology
a level
aqa
biological
molecules
pdf
biological molecules
unit 1
notes

⚪
Fats

Introducing lipids and triglycerides:
Lipids are organic molecules with 2 main types- triglycerides and
phospholipids.
Triglycerides and phospholipids have different but important roles:

Triglycerides are a good source of energy

Phospholipids have a structural role in the cell membrane

Lipids are mostly compsed of carbon and hydrogen with some oxygen-
hydrocarbon chains found in it
Lipids are large, complex molecules (macromolecules) but they are not
polymers.
Lipids are also non-polar molecules and therefore they will not dissolve in
water.

Structure of triglycerides:
1 glycerol, 3 fatty acids
Glycerol is an organic alcohol with 3 hydroxyl (-OH) groups
Fatty acids are organic acids that have a carbocyl (-COOH) group joined to a
hydrocarbon tail- they are a type of carboxylic acid.
The letter R is often used to represent the hydrocarbon tail.

Fats 1

, Ester bonding in triglycerides:
A triglyceride molecule is formed by joining one molecule of glycerol to 3 fatty
acids through condensation reactions.
A condensation reaction forms water as one oxygen atom and two hydrogen
atoms are removed from the glycerol and fatty acid

Fats 2

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