ALL microorganisms that live in the human body are harmful
Indicate whether the statement is true or false.
Answer: FALSE
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Viruses are composed of only
a. proteins. b. carbohydrates and proteins. c. proteins and nucleic acids. d. nucleic acids. e. carbohydrates, proteins, lipids, and nucleic acids.
Where does the copper used for wiring and plumbing come from?
a. Most copper is found in ocean sediments. b. Most copper is mined from the ground. c. Most copper is found along riverbanks. d. All copper is mined from the surface. e. All copper is manufactured synthetically in factories.
A decrease in which hormone might cause an overproduction of stomach acids?
a. gastrin b. somatostatin c. CCK d. secretin e. GIP
Which pair of structures, found in different organisms, both serve to increase the absorptive surfaces of the intestines?
a. choanocytes and gastric ceca b. proventriculus and villi c. choanocytes and proventriculus d. typhlosoles and villi