A-Level Biology Specification

AQA 7402

Section 1.3: Lipids

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#1.3.1

Triglycerides and phospholipids are two groups of lipid.

#1.3.2

Triglycerides are formed by the condensation of one molecule of glycerol and three molecules of fatty acid.

#1.3.3

A condensation reaction between glycerol and a fatty acid (RCOOH) forms an ester bond.

#1.3.4

The R-group of a fatty acid may be saturated or unsaturated.

#1.3.5

In phospholipids, one of the fatty acids of a triglyceride is substituted by a phosphate-containing group.

#1.3.6

The different properties of triglycerides and phospholipids related to their different structures.

#1.3.7

The emulsion test for lipids.

#1.3.8

Students should be able to:

- recognise, from diagrams, saturated and unsaturated fatty acids
- explain the different properties of triglycerides and phospholipids.