Which of the following is a flaplike structure
that helps prevent food from entering the
windpipe?
a. uvula
b. pharynx
c. larynx
d. epiglottis
e. esophagus
D
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The primary action in hand washing that prevents the distribution or transmission of microor-ganisms is:
a. the amount of soap used. b. the temperature of the water. c. the mechanical action of rubbing. d. the chemical activities in the soap.
Which of the following DOES NOT have a major effect on the rate of transpiration?
a. air temperature b. relative humidity c. air movement d. amount of direct solar radiation e. daily fluctuations in atmospheric carbon dioxide concentrations
All EXCEPT which are true for Entamoeba
histolytica? a. It is a parasite inhabiting the human gut. b. It is the cause of amoebic dysentery. c. 50 million people are infected annually by this species. d. The organism is transmitted from person to person by an insect vector. e. This organism is transmitted through contaminated drinking water.
The portion of tooth that projects above the gums is called the
A. enamel. B. pulp. C. dentin. D. crown. E. cementum.