A scientist discovers a chemical in certain rocks that kills bacteria when it is mixed with sterile water in a test tube. She cannot market extracts that contain this chemical as a dietary supplement, because it ________.
A. must first undergo scientific testing to determine its effectiveness
B. does not contain dietary ingredients
C. has to receive a U.S. patent before the FDA will approve its use
D. contains more than one kind of natural material
Answer: B
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The three active forms of vitamin A in our bodies are collectively referred to as the
A) retinoids. B) carotenoids. C) antioxidants. D) free radicals.
The amount of energy in calories per gram that is absorbed or emitted as a substance undergoes a change from a solid to a liquid or gas is called
A. latent heat. B. specific heat. C. melting point. D. heat of vaporization. E. heat of solidification.
It is appropriate to add solid foods to an infant's diet when he or she reaches age:
a. 2 to 3 months. b. 4 to 6 months. c. 6 to 7 months. d. 12 months.
Fatty acids may differ from one another: a. in chain length and in number of nitrogen atoms
b. in degree of saturation and in number of calories. c. in number of calories and in whether or not they contain carbon. d. in chain length and in degree of saturation. e. in whether or not they contain carbon and in degree of saturation.