Molecules- Lipids

Question 1

3 facts about lipids

Answer 1

-they are insoluble in water
-they contain carbon, hydrogen and oxygen.
-the 2 main types for us are triglycerides and phospholipids

Question 2

What is the role of phospholipids in the body

Answer 2

Found in cell membranes and membranes around organelles, they provide flexibility and transfer of lipid soluble substances across the membrane

Question 3

How do lipids create energy in the body

Answer 3

Lipids contain more energy for the same mass as carbohydrate and release water when oxidised. Stored in adipocytes

Question 4

How do lipids create insulation in the body

Answer 4

Slow conductors of heat so storage u dear the skin helps retain body heat and provide electrical insulation as myelin

Question 5

How do lipids create protection in the body

Answer 5

Fat is stored around the body top provide additional protection

Question 6

What is an ester bond

Answer 6

A bond in a triglyceride where each fatty acid bonds with glycerol a condensation reaction and three molecules of water

Question 7

Describe the structure of a triglyceride

Answer 7

Have a low mass to energy ratio so many can be stored in a small volume

Question 8

What are phospholipids made of

Answer 8

One molecule of glycerol, two fatty acid chains and one phosphate molecule

Question 9

State two functions of lipids in the body and give an example

Answer 9

Protection and insulation fat protects the organs in the body such as the ones that aren’t protected by cartilage or bone, fat also helps retain body heat

Question 10

What is the key different between a phospholipid and a triglyceride in terms of structure

Answer 10

Phospholipids are a sphere with a hydrophilic head and hydrophobic tails. Triglycerides are E shaped with 3 fatty acid chains and one glycerol molecule