Lipids (fats & oils)

Question 1

What elements to lipids contain?

Answer 1

Carbon, hydrogen, oxygen

Question 2

What is the ratio of elements in lipids like?

Answer 2

They have no simple ratio

Question 3

What do lipids have very little of?

Answer 3

Oxygen

Question 4

When are fats solid?

When are oils liquids?

Answer 4

Fats are lipids that are solid at room temperature (20 degrees celcius)
Oils are lipids that are liquid at room temperature.

Question 5

What are the smallest lipids made up of?

Answer 5

The smallest lipids are made up of one molecule of glycerol linked to three fatty acid molecules

Question 6

What is a triglyceride structure

Answer 6

One molecule of glycerol linked to three fatty acids molecules

Question 7

What are sources of lipids

Answer 7

Butter, oils, margarine, cream, fried food

Question 8

What is the structural role of lipids? 3

Answer 8

They are important food stores in plants and animals. One gram of lipid contains twice as much energy as a gram of carbohydrate.

Lipids combine with phosphorus to form phospholipids and with proteins to form lipoproteins. Both of these are important in the structure of cell membranes.

In animals, the stored lipids have secondary function like heat insulation and protection of organs.

Question 9

What is the metabolic role of lipids?

Answer 9

Lipids can be broken down in respiration ro release energy

Question 10

Define phospholipids

Answer 10

Phospholipids are fat-like substances in which one of the fatty acids is replaced by a phosphate group or had a phosphate group added to it