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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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 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
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