Quiz 9

Question 1

Fatty Acids

Answer 1

• Carboxylic acids between 12 and 20 carbon

* generally made up of an even number of carbons

Question 2

Saturated Fatty Acids

Answer 2

Contain only single bonds

Question 3

Monounsaturated fatty acids

Answer 3

Contain one double bond

Question 4

Polyunsaturated Fatty Acids

Answer 4

Contain two or more double bonds

Question 5

Saturated fatty acids have higher melting and boiling points

Answer 5

• Hydrocarbon tails can closely pack together
• increased London forces, with increasing hydrocarbon chain length.
• as number of carbons increases so does the boiling point

Question 6

Unsaturated Fatty Acids with cis- double bonds cannot pack as tightly. Why?

Answer 6

• Lowers amount of intermolecular forces

* leads to decreased melting and boiling points

Question 7

Which of the following fatty acids will have the lowest boiling point?

A) saturated
B) monounsaturated
C) polyunsaturated

Answer 7

Answer:C

Question 8

Reacting a fatty acid with NaOH....
A) increases water solubility
B) decreases water solubility 
C) shortens the carbon chain
D) makes molecule more hydrophobic

Answer 8

Answer:A

Question 9

Arachidonic acid is what type of fatty acid?

A) saturated fatty acid
B) omega 3 fatty acid
C) monounsaturated fatty acid
D) omega 6 fatty acid

Answer 9

Answer:D

Question 10

Which of the following reactions is responsible for the smell of rancid butter?
A) hydrogenation 
B) saponification 
C) autooxidation 
D) Autoreduction

Answer 10

Answer:C

Question 11

Which of the following reactions can raise boiling point of a triglyceride making it more solid?
A) hydrogenation 
B) saponification
C)autooxidation
D) autoreduction

Answer 11

Answer:A

Question 12

Steroids

Answer 12

3 fused 6 members rings and 15 members ring

Question 13

Which lipid are steroid hormones derived from?

A) insulin
B) glucose
C) cortisone
D) cholesterol

Answer 13

Answer:D

Question 14

Which type of lipoprotein is responsible for taking cholesterol and phospholipids from cells back to the liver?
A) chylomicrons
B) VLDL
C) LDL
D) HDL

Answer 14

Answer:D

Question 15

What is true about The semipermeable cell membrane?
A) All things can pass through
B) molecules are locked in place
C) everything is blocked without a channel
D) only small molecules may pass through

Answer 15

Answer:D

Question 16

What class of lipids serve as an energy source and protect against gaining or losing water?
A) phospholipids 
B) waxes
C) fatty acids
D) steroids

Answer 16

Answer:B

Question 17

What are eicksanoids?

Answer 17

Responsible for causing pain, inflammation, fever blood clotting and muscle contractions In lungs