Lipids - exam practice

The structure of phospholipids includes the following

1 - polar phosphate heads

2 - hydrophobic fatty acid chains

3 - saturated fatty acid chains

Which of these are essential for the formation of a phospholipid bilayer in a cell-surface membrane?

Which formula(e) of fatty acids represents a saturated fatty acid?

1 - palmitic acid, C₁₅H₃₁COOH

2 - oleic acid, C₁₇H₃₃COOH

3 - linoleic acid, C₁₇H₃₁COOH

Linseed oil is a polyunsaturated triglyceride that can be extracted from the seeds of the flax plant, Linum usitatissimum.

A diagram of a linseed oil molecule is shown below.

Which option correctly identifies the bond labelled W?

Cholesterol is an integral component of the cell-surface membrane.

Which statement about cholesterol is correct?

In unsaturated lipid molecules, where are double bonds located?

The diagram shows a triglyceride molecule that has been partially hydrolysed.

What will be the products of the total hydrolysis of the molecule shown?

Which statement about triglycerides is correct?

Which option is a type of reaction involved in the breakdown of a phospholipid?

Which option is a property of the phosphate group in phospholipids?

How many fatty acid residues are normally present in a phospholipid molecule?

Some foods contain ‘hydrogenated vegetable oils’. These are unsaturated fats that have been

converted to saturated fats.

Which property of the fats will have changed?