Exam 3 Review

lipids contain _ the amount of energy (per gram) of energy than carbs and proteins

• 5.5

• 2.5

• 2

• 7.5

lipoproteins, glycolipids, and phospholipids fall under which lipid type?

• Simple

• Sterol

• Compound

• Derived

Answer explanation

Compound lipids contain FA with alcohol, plus an additional functional group

which VFA does this image display?

• Propionic acid

• Acetic acid

• Butyric acid

• Malonic acid

Answer explanation

Butyric acid contains 4 carbons with a C=O and -OH

Which correctly displays the components of a triacylglyceride (TAG)

• 3 FA attached to a phosphate via phosphodiester bond

• 3 FA attached to a glycerol via ester linkage

• 2 FA attached to a glycerol via ester linkage

• None of these are correct

True or false:

Unsaturated FA have a higher melting point compared to saturated FA

• True

• False

Answer explanation

Saturated FA have more hydrogens, therefore increasing the MP

Saturation (# of double bonds) and chain length affect MP

Which of the following statements regarding FA confirmation is false?

• Unsaturated FA can be found in both the trans and cis confirmation

• The most naturally occurring unsaturated FAs are in the cis confirmation

• Trans FA are the result of human processing

• All of the above are true statements

True or false:

lipase activity is responsible for the breakdown of both cis and trans FA

• True

• False

Answer explanation

Lipase is only responsible for the breakdown of cis FA, trans FA will remain in the bloodstream

Which of the following is not an example of a sterol?

• Bile

• Cholesterol

• Linoleic

• Vitamin D

Answer explanation

Linoleic is an essential FA

How would you name this essential FA?

• linolenic (18:3)

• linoleic (18:3)

• linolenic (18:2)

• arachidonic (20:4)

Which of the following is not a consequence of excess dietary lipid intake?

• decrease palatability

• increased fermentation

• reduced DMI

• reduced digestibility