Acorn worms, members of the phylum ____, use their mucus-coated proboscis to construct U-shaped burrows to trap
food particles.
a. Hemichordata
b. Echinodermata
c. Cnidaria
d. Arthropoda
e. Chordata
ANSWER: a
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What role does Acidithiobacillus ferrooxidans play in the copper leaching process?
A) oxidation of sulfide to sulfate B) reduction of oxidized iron (Fe3+) to reduced iron (Fe2+) C) oxidation of reduced iron (Fe2+) to oxidized iron (Fe3+) D) reduction of sulfate to sulfide
Which of the following is a genetically modified crop species?
a. corn b. peppers c. radishes d. asparagus
Coal-burning power plants also are big contributors
to __________, which alters habitats and kills many organisms. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about the sympathetic and parasympathetic nervous systems is
true? a. The sympathetic system controls external stimuli, while the parasympathetic system controls internal stimuli. b. The sympathetic system typically stimulates organ activity, while the parasympathetic system typically inhibits it. c. The sympathetic system is under voluntary control, while control of the parasympathetic is involuntary. d. Both nervous systems stimulate the activities of many organs. e. Both release the neurotransmitters serotonin and acetylcholine