15) What is the chief purpose of using ozone as a commercial water treatment?
a.It kills microorganisms
b.It complexes with heavy metals
c.It stabilizes the carbon filtration process
d.It promotes chlorine dissipation and thus enhances taste
16) What is the placenta?
a.An organ from which the infant receives nourishment
b.A muscular organ within which the infant develops before birth
c.The developing infant from the eighth week after conception until birth
d.The developing infant during its second through eighth week after conception
17) Which of the following is a feature of diabetes?
a.Many people with type 2 diabetes are obese
b.Most people who have diabetes require insulin therapy
c.Diabetes results chiefly from excess dietary intake of simple carbohydrates
d.People with type 1 diabetes fail to respond to the insulin made by the pancreas
18) Excessive consumption of soft drinks, orange juice, and sports drinks increases risk
for development of caries because they contain sugar and have
a.a low pH
b.organic acids
c.resistant starch
d.insufficient fluoride
19) Which of the following is a feature of calcium in the body?
a.High blood calcium levels correlate with tetany
b.Abnormal dietary calcium intakes promote calcium rigor
c.Higher calcium intakes correlate with lower body fatness
d.Efficiency of intestinal calcium absorption is similar for children and adults