Lipids

Question 1

What are lipids?

Answer 1

Waterproof biological molecules

Question 2

What are the 2 types of lipids?

Answer 2

Saturated and Unsaturated Lipids

Question 3

Describe Saturated Lipids

Answer 3

Saturated lipids are animal fats. They are made up of single bonded carbons which means that it has no kinks and is straight. Compact.

Question 4

Describe Unsaturated Lipids.

Answer 4

Unsaturated Lipids are plant oils. They have double bonded carbons, resulting in more kinks. Not compact.

Question 5

Why do Unsaturated Lipids have a lower melting point?

Answer 5

Unsaturated Lipids have a much lower melting point because of the weaker intermolecular forces caused by the double bonded carbons reducing strength. The more kinks mean that it cannot be compacted close together.

Question 6

What are lipids in water?

Answer 6

Non- polar and insoluble. (Oil and water don’t mix easily)

Question 7

Describe HDL

Answer 7

‘Good’ cholesterol
Decreases blood cholesterol level
Transports cholesterol from body tissues to the liver
Includes Unsaturated Lipids, proteins and cholesterol.

Question 8

Describe LDL

Answer 8

‘Bad’ cholesterol
Increases cholesterol level
Transports cholesterol from the liver to the blood
Includes Saturated Lipids, proteins and cholesterol

Question 9

What components make up a triglyceride?

Answer 9

Glycerol and 3x fatty acids

Question 10

How is water removed from a triglyceride?

Answer 10

Through a condensation reaction (ester bond)