Question 1

Which of the following elements are found in lipids?

Accepted Answer

C, H, O, P

Answer

C, H, O, N, P, S

Answer

C, H, O

Answer

C, H, O, N

Question 2

Which of the following is not a lipid?

Accepted Answer

lipase

Answer

fat

Answer

phospholipid

Answer

steroid

Question 3

Which of the following describes the difference between a phospholipid and a fat?

Accepted Answer

Phospholipids have one less fatty acid than fats.

Answer

Phospholipids have one more fatty acid than fats.

Answer

Phospholipids are nonpolar and fats are polar.

Answer

Phospholipids are polar and fats are nonpolar.

Question 4

Phospholipids are amphipathic. Which of the following describes how that term applies to phospholipids?

Accepted Answer

The phosphate group is polar and the fatty acids are nonpolar.

Answer

The phosphate group is nonpolar and the fatty acids are polar.

Answer

The phosphate group can amplify signal transduction by phosporylating signaling molecules.

Answer

The fatty acids can amplify signal transduction by phosporylating signaling molecules.

Question 5

Steroids are a type of hormone. Polar materials require a transport protein while nonpolar materials can pass easily through the plasma membrane. Which of the following describes how steroid hormones enter the cell?

Accepted Answer

Steroids are nonpolar so they pass easily through the plasma membrane.

Answer

Steroids are polar so they pass easily through the plasma membrane.

Answer

Steroids are nonpolar so they require a transport protein to pass through the plasma membrane.

Answer

Steroids are polar so they require a transport protein to pass through the plasma membrane.

Question 6

Which of the following describes the differences between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have more double bonds than saturated fatty acids.

Answer

Saturated fatty acids are more polar than unsaturated fatty acids.

Answer

Unsaturated fatty acids are more polar than saturated fatty acids.

Answer

Saturated fatty acids have more double bonds than saturated fatty acids.

Question 7

Lipids are polymers.

Accepted Answer

false

Answer

true

Question 8

Which of the following describes the function of cholesterol (a steroid) in the plasma membrane?

Accepted Answer

Cholesterol binds to the fatty acid tails to maintain fluidity of the membrane.

Answer

Cholesterol provides energy for active transport across the membrane.

Answer

Cholesterol acts as a receptor molecule to bind to signaling molecules in the signal transduction pathway.

Answer

Cholesterol is a polar compound that aids in the transport of polar substances across the membrane.

Question 9

Which of the following describes the process to add a fatty acid to the glycerol in a triglyceride?

Accepted Answer

This is a dehydration reaction leading to water loss.

Answer

This is a dehydration reaction leading to water used.

Answer

This is a hydrolysis reaction leading to water used.

Answer

This is a hydrolysis reaction leading to water loss.

Question 10

Which of the following describes why lipids are hydrophobic?

Accepted Answer

Lipids are composed mostly of hydrocarbons which is nonpolar.

Answer

Lipids are gaseous materials that do not dissolve in water.

Answer

Lipids have hydrogen bonds that repel the hydrogen bonds in water.

Answer

Lipids have more neutrons on their atoms making the compound neutral.

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