Lipids are a diverse group of hydrophobic molecules

Question 1

Lipids include fats, waxes, oils, phospholipids, and steroids. What characteristic do all lipids share?

Answer 1

Hydrophobic – don’t dissolve in water

Question 2

What are the building blocks of fats? Label them on this figure.

Answer 2

Triglyceride – 1 glycerol (gray), 3 fatty acid chains (orange)
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Question 3

Why are many unsaturated fats liquid at room temperature?

Answer 3

They have one double bond which bends/kinks the fatty acid chain

Question 4

What is a trans fat?

Answer 4

Making a solid saturated fat from adding hydrogen to unsaturated fat

Question 5

Ex of trans fat

Answer 5

Ex: margarine

Question 6

List 3 important functions of fats.

Answer 6

Long term storage of energy, cell membranes, insulation

Question 7

Which of the two fatty acid chains in the figure with question 30 is unsaturated? Label it. How do you know it is unsaturated?

Answer 7

The one that kinks/bends – because it has a double bond which makes it bend

Question 8

. What lipid is pictured below?

Answer 8

Steroid – 4 fused rings

Question 9

What are other examples of steroids?

Answer 9

Cholesterol – stabilizes the cell membranes, hormones