A fat molecule consists of . a. carbohydrates and proteins; b. complex carbohydrates only; c. saturated oxygen atoms; d. a carbon skeleton and fatty acids

Which of the following terms is least like the others? a. monosaccharide; b. phospholipid; c. fat; d. steroid; e. lipid

The main constituents of the plasma membrane are . a. carbohydrates and lipids; b. proteins and phospholipids; c. fats and carbohydrates; d. fatty acids and nucleic acids

Unsaturated fats a. have double bonds in their fatty acid chains. b. have fewer fatty acid molecules per fat molecule. c. are associated with greater health risks than are saturated fats. d. are more common in animals than in plants.

Which of the following substances is a major component of the cell membrane of a fungus? a. cellulose b. chitin c. cholesterol d. phospholipids

Another aspect of the Nurses' Health Study looked at the percentage of change in the risk of coronary heart disease associated with substituting one dietary component for another. These results estimated that replacement of 5% of energy from saturated fat in the diet with unsaturated fats would reduce the risk of heart disease by 42%, and that the replacement of 2% of energy from trans fat with unsaturated fats would reduce the risk by 53%. Explain what these numbers mean.