Which of the following phyla is the most diverse and numerous of all animal phyla?
A. The arthropods
B. The mollusks
C. The echinoderms
D. The cnidarians
Answer: A
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Triglycerides are composed of ________ and ________
a. three fatty acids / one glycerol b. four fused hydrocarbon rings / hydroxyl groups c. three glycerols / one fatty acid d. a hydrophilic head / two hydrophobic tails
Worldwide, decay of organic matter is important to the global carbon cycle because it ____ tens of
billions of tons of carbon dioxide each year.
a. removes from the atmosphere b. prevents the planet from losing to space c. returns to the atmosphere d. prevents plants from having access to e. releases to space
Suppose a single nondisjunction event occurs during anaphase II of meiosis in a normal male cell from meiosis I. Of
the resulting sperm, ____.
a. three would be normal and one would have an extra chromosome b. two would be normal, one would have an extra chromosome, and one would be missing a chromosome c. two would have an extra chromosome and two would be missing a chromosome d. all four sperm would have an extra chromosome e. three would have an extra chromosome and one would be normal
The bacterium Thermus aquaticus proved to be
important in biology because a. it put researchers on a path that led to the great domain of life, the Archaea. b. it makes a heat resistant enzyme. c. its heat-resistant enzyme can catalyze the polymerase chain reaction. d. synthetic forms of its heat-resistant enzyme triggered a revolution in biotechnology. e. all of these are true.