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Section V – Metabolism of Lipids

Which one of the following statements concerning fatty acid molecules is CORRECT?

A. They consist of a carboxylic acid head group attached to a carbohydrate chain.

B. They are called polyunsaturated when they contain one or more carbon–carbon double bonds.

C. Their melting points increase with increasing unsaturation.

D. They almost always have their double bonds in the cis configuration when they occur naturally.

E. They occur in the body mainly in the form of free (nonesterified) fatty acids.

Which one of the following is NOT a phospholipid?

A. Sphingomyelin

B. Plasmalogen

C. Cardiolipin

D. Galactosylceramide

E. Lysolecithin

Which one of the following statements about gangliosides is INCORRECT?

A. They are derived from galactosylceramide.

B. They contain one or more molecules of sialic acid.

C. They are present in nervous tissue in high concentrations.

D. The ganglioside GM1 is the receptor for cholera toxin in the human intestine.

E. They function in cell–cell recognition.

Gangliosides are derived from glucosylceramide.

Which one of the following is a chain-breaking antioxidant?

A. Glutathione peroxidase

B. Selenium

C. Superoxide dismutase

D. EDTA

E. Catalase

A, B, D, and E are classed as preventive antioxidants as they act by reducing the rate of chain initiation.

After they are produced from acetyl-CoA in the liver, ketone bodies are mainly used for which one of the following processes?

A. Excretion as waste products

B. Energy generation in the liver

C. Conversion to fatty acids for storage of energy

D. Generation of energy in the tissues

E. Generation of energy in red blood cells

The subcellular site of the ...

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