Lipid Practice Problems

Lipid Practice Problems

Question 1:

Draw the triacylglycerol composed of glycerol and lauric acid.
Lauric Acid = CH₃(CH₂)₁₀CO₂H
Glycerol = CH₂OHCHOHCH₂OH

Problem solution

Question 2:

The following triacylglycerol is treated with excess H₂ and Pd.

Part A

How many moles of H₂ can react with one mole of the triacylglycerol?

Zero One Two Three Four Five Six

Part B

Draw the structure of the product.

Part C

What change in physical properties will be observed as this reaction takes place?

Solution (Parts B and C only)
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Question 3:

Unsaturated fats are preferred over saturated fatty acids for nutritional reasons. Would you expect a deep sea fish (living in cold water) or a shallow water fish (living in warmer water) to have a higher percentage of unsaturated fatty acids in its tissues?

A deep sea fish A shallow water fish

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Question 4:

Check any statements in the following list that are TRUE. All comments concern the fluid mosaic membrane model

Molecules in a lipid bilayer are stationary unless they need to perform a function
Molecules in a lipid bilayer are in constant motion
Molecules move faster at higher temperatures
Cholesterol lowers the melting point of a membrane
Cholesterol raises the melting point of a membrane
Cholesterol has little effect on the melting point of a membrane
Molecules in one half of the bilayer seldom cross to the other side of the bilayer

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Last modified 4/21/97

Abby Parrill
Department of Chemistry
Michigan State University

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