Lipids

Question 1

A typical fat molecule, known as triglyceride, is formed from

Answer 1

one glycerol and three fatty acid tails

Question 2

Find the odd man out.
		long hydrocarbon chains
		hydrophobic
		non-polar
		hydrophilic

Answer 2

hydrophillic

Question 3

Find the odd man out.
		polar
		hydrophilic
		long hydrocarbon chain
		water-loving

Answer 3

long hydrocarbon chain

Question 4

When oil is mixed with water, a non-miscible layer is formed because

Answer 4

v oil is organic while water is inorganic

Question 5

When comparing the same mass of triglycerides and carbohydrates, triglycerides produce __ more energy then carbohydrates.

Answer 5

2X

Question 6

Which of the following is not the function of fats?
act as cushion to protect internal organs
provide insulation
energy storage and reserve
act as enzymes (the catalyst in biochemical reactions)

Answer 6

act as enzymes (the catalyst in biochemical reactions)

Question 7

Adipose tissues are also known as fat under the skin and subcutaneous fat.

Answer 7

t

Question 8

Fatty acids without double bond can be packed tightly, therefore

Answer 8

therefore they exist as solid in room temperature. This triglyceride is known as saturated fat

Question 9

When talking about cis- and trans-fat, they usually refer to those fatty acid tails with

Answer 9

carbon-carbon double bond

Question 10

Most naturally forming biomolecules are in ________ form.

Answer 10

cis

Question 11

The purpose of undergoing partial hydrogenation of unsaturated fat is to

Answer 11

enhance its shelf life

Question 12

One undesirable effect of partial hydrogenation is

Answer 12

the production of trans fat

Question 13

Excessive and prolonged intake of trans-fat will result in heart attack because

Answer 13

accumulation of cholesterol on the arterial wall

Question 14

A fatty acid (18:1) has

Answer 14

18 carbon atoms and 1 double bond

Question 15

Phospholipid is important to us because it is a component of

Answer 15

cell membrane

Question 16

Phospholipid has

Answer 16

vtwo fatty acid tails

Question 17

Overall, the phospholipid bilayer is hydrophobic in nature due t

Answer 17

the presence of fatty acid tails

Question 18

The phospholipid bilayer is hydrophobic in nature, therefore

Answer 18

organic solvent can permeate readily

Question 19

Cholesterol, a steroid, is a precursor of a number of important biomolecules, except:
estradiol (estrogen)
		testosterone
		insulin
		vitamin D

Answer 19

insulin

Question 20

In this chapter, ___ major kinds of lipids are introduced.

Answer 20

3

Question 21

How can steroids be identified??

Answer 21

4 rings

Question 22

Cholesterol is one of the steroids.. What are functions??

Answer 22

1. Components of cell membrane
2. Precursor eat roger
3. Precursor testosterone