Unit 1-Lesson 5 Lipids

Question 1

What are Lipids?

Answer 1

Hydrophobic molecule

Question 2

Lipids are soluble in water T/F

Answer 2

False Lipids are insoluble in water because their hydrophobic

Question 3

What are the different types of Lipids?

Answer 3

1. Fatty acids (Triglycerides)
2. Phospholipids
3. Steroids
4. Waxes

Question 4

What are the important roles for Lipids?

Answer 4

Insulation to the body
Protect internal (vital) organs
Aids vitamin absorption and synthesis of hormones

Question 5

What is the primary function of a Lipid?

Answer 5

Energy Storage

Question 6

What are the 2 sub units molecules does glyceride contain?

Answer 6

1. glycerol
2. (3) fatty acid

Question 7

What are the characteristics of unsaturated fats?

Answer 7

Double bonds between carbon
found in plants fats
liquid at room temperature
E.g. olive oil, almonds, fish

Question 7

What are the characteristics of Saturated fats?

Answer 7

Single bonds with carbon
Found in animal fats
Solid at room temperature
Raises level of blood cholesterol
E.g. bacon grease, lard, butter

Question 8

Describe Hydrogenation?

Answer 8

Hydrogenation: hydrogen atoms are added to unsaturated fats (oils) making them saturated (solid fat)

Question 9

What are the effects of partial hydrogenation?

Answer 9

Creates trans fats

Question 10

List the characteristics of Steroids?

Answer 10

Lipids containing carbon bonded rings
E.g. sex hormones (estrogen/testosterone)
E.g. Vitamin D (bone building, Ca and P metabolism)
E.g. bile salts (fat digestion)
E.g. Cholesterol

Question 11

What are the characteristics of Waxes?

Answer 11

Repel water
In animals - protect skin and hair
In birds - keep feathers dry
In plants (cutin) - restricts water loss