23 WJEC Biology AS Level - Marianne Izen - 2nd Edition

Question 1

Metabolic water

Answer 1

Water released in the cells of an organism by its metabolic reactions.

Question 2

Name a mono-unsaturated fatty acid

Answer 2

Oleic acid

You will not be expected to remember the names and formulae of the fatty acid

Question 3

Name a saturated fatty acid

Answer 3

Palmitic acid

You will not be expected to remember the names and formulae of the fatty acids shown here.

Question 4

Name a mono-unsaturated fatty acid

Answer 4

Question 5

Identify the models of palmitic acid and oleic acid

Answer 5

Question 6

Draw a table to summarise the different types of lipids, their function and key comments

Answer 6

Question 7

Answer 7

glycerol

unsaturated

phosphate

membranes

Question 8

What are the other roles of lipids?

Answer 8

The other roles of lipids include some hormones.

Examples:
a. oestrogen in animals
b. some phytohormones in plants, eg. gibberellin.

Some vitamins, such as vitamin A, are lipid-based.