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Section V: Metabolism of Lipids

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

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

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

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C. Their melting points increase with increasing unsaturation.

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

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

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Which one of the following is NOT a phospholipid?

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A. Sphingomyelin

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B. Plasmalogen

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C. Cardiolipin

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D. Galactosylceramide

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E. Lysolecithin

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Which one of the following statements about gangliosides is INCORRECT?

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A. They are derived from galactosylceramide.

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

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

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

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E. They function in cell-cell recognition.

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A. Gangliosides are derived from glucosylceramide.

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

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A. Glutathione peroxidase

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B. Selenium

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C. Superoxide dismutase

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D. EDTA

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E. Catalase

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

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

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A. Excretion as waste products

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B. Energy generation in the liver

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C. Conversion to fatty acids for storage of energy

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D. Generation of energy in the tissues

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E. Generation of energy in red blood cells

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The subcellular site of ...

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