3.1.3 lipids Flashcards Preview

A Level Biology - Biological Molecules > 3.1.3 lipids > Flashcards

Flashcards in 3.1.3 lipids Deck (9)
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1

Triglycerides and phospholipids are two groups of lipid

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2

Triglycerides are formed by the condensation of one molecule of glycerol (CH2OH) and three molecules of fatty acid

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3

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

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4

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

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5

If something is saturated it has no double bonds

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6

If something is unsaturated It has either

One double bond between carbon atoms -> monounsaturated

Or

More than one double bond between carbon atoms -> polyunsaturated

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7

In a phospholipid one of the fatty acids of a triglyceride is substituted by a phosphate containing group so there's one molecule of glycerol bonded too two fatty acids and then a phosphate contains group

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8

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

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9

The test for lipids is know as the emulsion test . Ethanol is added to a solution that potentially could contain lipids , the test tube is then shaken and water is added to it , a positive result would be indicated by the formation of a cloudy white suspension , if a negative result occurs the solution will remain colourless.

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