The special proteins that inactivate foreign bacteria and viruses are ____
a. enzymes
b. antibodies
c. hormones
d. structural proteins
e. transport proteins
b
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Which of the following is a characteristic of vitamin A in foods?
a. Fast foods are generally considered good sources of vitamin A b. A regular intake of chicken liver is known to induce toxicity in children c. Xanthophylls in certain vegetables can be converted to active vitamin A in the liver d. Chlorophyll in vegetables can be converted to active vitamin A in the intestinal cells
For a healthy person, the percentage of daily kcalories supplied by protein should be:
a. 5% to 10%. b. 10% to 35%. c. more than 25%. d. more than 35%.
Breast milk as the sole source of nutrition, up to the first 6 months in healthy infants, is satisfactory for all nutrients EXCEPT
a. sodium. b. vitamin D. c. iron and folate. d. zinc and vitamin A.
Which stimulus would be least likely to trigger the letdown reflex?
a. release of oxytocin due to suckling b. hearing a baby cry c. sexual arousal d. release of prolactin-inhibiting factor from the hypothalamus e. thinking about nursing