Vitamin A is stable EXCEPT when exposed to:
a. heat.
b. light and oxygen.
c. cold temperatures such as in a refrigerator.
d. fat.
Ans: b. light and oxygen.
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You are counseling a pregnant woman who is experiencing "morning sickness." To alleviate this condition you tell her to:
a. sip juice or coffee when nauseated b. nibble on soda crackers or dry toast. c. try drinking beverages between meals only. d. drink an herbal tea. e. see her doctor for an anti-nausea medication.
According to the observations of a nutrition scientist, laboratory mice are healthier when their diet contains physiological levels of vitamin D than when their diet lacks the micronutrient. The scientist hypothesizes that mice will be less likely to develop cancer when they consume a diet that supplies megadoses of vitamin D. Based on this information, the scientist is ready to
A. set up an experimental epidemiological study to test the vitamin D and cancer hypothesis in mice. B. design a double-blind study to test the vitamin D and cancer hypothesis in mice. C. plan a retrospective study involving at least 5,000 laboratory mice to test the vitamin D and cancer hypothesis in mice. D. conduct a controlled laboratory experiment to test the vitamin D and cancer hypothesis in mice.
What pituitary hormone works at the level of the collecting duct to either increase or decrease absorption of water in order to maintain plasma volume and thus blood pressure?
a. aldosterone b. vasopressin c. cortisol d. testosterone e. epinephrine
Substances widely used for many years without apparent ill effects are on the _____ list
a. FDA b. GRAS c. Delaney d. Additive Safety e. Preferred Additive