Chapter 12 Multiple Choice Questions

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. Which of the following statements concerning the structure and properties of lipids is correct?

Dietary fats are comprised of three fatty acids bonded to a molecule of glycerol by ether linkages. correct incorrect

Acetic acid is a typical medium chain fatty acid. correct incorrect

Naturally occurring unsaturated fatty acids generally form less effective non-polar interactions with each other. correct incorrect

Phospholipids are highly polar molecules. correct incorrect

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. Which of the following is NOT classified as a fatty acid?

Stearic acid. correct incorrect

Oleic acid. correct incorrect

Phosphoric acid. correct incorrect

Arachidonic acid. correct incorrect

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. Which of the following is NOT a phospholipid?

Cholesterol correct incorrect

Phosphatidylcholine correct incorrect

Cephalin correct incorrect

Lecithin correct incorrect

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. Which of the following statement about triglycerides is NOT true?

They are commonly referred to as fats. correct incorrect

They are composed of three fatty acids esterified with glycerol. correct incorrect

Naturally-occurring unsaturated fatty acids have a trans configuration. correct incorrect

In nature, mixed triglycerides are common correct incorrect

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. Phospholipids are an important component of cell membranes because:

They are comprised of a polar head group and a non-polar tail. correct incorrect

One of their fatty acids is unsaturated. correct incorrect

Glycerol is part of their structure. correct incorrect

The non-polar tail prevents access of molecules to the cell. correct incorrect

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. Steroids usually share which common structural feature?

Methyl groups at position 8 and 9. correct incorrect

A hydrocarbon functional group at position 17. correct incorrect

A nitrogen containing functional group at position 3. correct incorrect

Four fused six-membered rings. correct incorrect

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. Which of the following statements about cholesterol is NOT true?

It has an OH group at position 3. correct incorrect

It is the biosynthetic precursor to testosterone. correct incorrect

It is the biosynthetic precursor to cortisol. correct incorrect

It is the biosynthetic precursor to ethinyloestradiol correct incorrect

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. Which statement about fatty acid metabolism is true?

The product is pyruvate, which then enters the citric acid cycle correct incorrect

The product is acetyl-CoA, which then enters the citric acid cycle if there is a balance between fat and carbohydrates correct incorrect

The product is a short fatty acyl-CoA, which is stored in the adipose tissue correct incorrect

The product is acetyl-CoA, which forms acetoacetate and D-3-hydroxybutyrate if there is a balance between fat and carbohydrate correct incorrect

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. Which of the following is not involved in cellular breakdown of fatty acids?

Succinyl CoA correct incorrect

Acetyl CoA correct incorrect

FAD correct incorrect

NAD⁺ correct incorrect

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. Which of the following is NOT a true essential fatty acid?

Linolenic acid correct incorrect

Myristic acid correct incorrect

Linoleic acid correct incorrect

Arachidonic acid correct incorrect