Biological Molecules: Lipids

Question 1

Which of the following is a characteristic of lipids?

A. They are polar molecules
C. They are inflammable.
B. They are not soluble in water.
D. They are either fats or oils

Answer 1

B. They are not soluble in water.

Question 2

Oil and water don’t mix because water has polar bonds while oils have nonpolar bonds. True or False

Answer 2

True

Question 3

What are the components of a triglyceride molecule

Answer 3

One glycerol and three fatty acids.

Question 4

Like soap, which of the following molecules is also amphophilic – having both a hydrophilic and hydrophobic end?

A. water
C. waxes
B. phospholipids
D. steroids

Answer 4

B. phospholipids

Question 5

Some functions of lipids include waterproofing, temperature regulation, and long-term energy storage. Which of the following is NOT a common type of lipids?

A. fats
C. oils
B. waxes
D. sugar

Answer 5

D. sugar

Question 6

Which of the following least describe lipids?

A. They are more soluble in water.
B. They are good at storing energy.
C. They are either strongly hydrophobic or amphipathic
D. Extraction of lipids from tissues require organic solvents.

Answer 6

B. They are good at storing energy.

Question 7

Find the incorrect statement about the biological functions of lipids.

A. Storage form of metabolic fuel.
B. Exhibit increased catalytic activity.
C. The structural component of membranes.
D. Have a protective function in bacteria, plant, and insects.

Answer 7

B. Exhibit increased catalytic activity.

Question 8

Both vegetable oil and butter are made up of fats. Why is butter solid at room temperature, while vegetable oil is liquid?

Answer 8

A. Butter is saturated fat and vegetable oil is an unsaturated fat.

Question 9

Unsaturated lipids are generally liquid at room temperature because
their hydrocarbons are _________ packed because of their _______ bonds.

Answer 9

D. loosely; double