题目内容

During the 1980’s researchers used computer models to predict the effect of life expectancy of reducing fat in the diet from 30% to 10% (commonly recommended for low fat diets). What did the research show in terms of life expectancy?

A. There was no change in life expectancy.
B. Life expectancy was extended by 3 years.
C. Life expectancy was reduced by 3 months.
D. Life expectancy was extended by 3 days to 3 months.
E. Life expectancy was reduced by 3 years.

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Trans fats do not occur naturally in food products.

A. True
B. False

Trans fats are an impurity of the hydrogenation process. The momentary addition of one hydrogen atom to the double bond followed by a rotation of the chain about the temporary single bond linkage in the fat molecule and loss of this hydrogen atom back to the catalyst permits the reformation of a double bond in the trans arrangement.

A. True
B. False

During the process of hydrogenation, hydrogen is added to the unsaturated fat to convert some of the "double bonds" into "single bonds" of saturated fat.

A. True
B. False

Carbon chains can rotate around a double bond (carbon=carbon or C=C).

A. True
B. False