Biologists use a classification system to group organisms in part because organisms
a. are going extinct
b. are very numerous and diverse
c. are too much alike
d. share too many derived characteristics
Ans: b. are very numerous and diverse
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Complementary DNA (cDNA) probes are produced using
A. RNA polymerase. B. DNA ligase. C. restriction endonucleases. D. reverse transcriptase.
Tissues present during organ development that are not found in the fully formed organ are removed by ____
a. apoptosis only b. differentiation only c. induction only d. apoptosis and differentiation e. apoptosis, differentiation, and induction
Historical data suggest that snowshoe-hare population cycles are caused by Canada lynx predation. Modern research has ________
a. confirmed this hypothesis and shown that lynx starve after having depressed the hare population b. demonstrated that snowshoe hares cycle even in captivity, indicating a genetic basis for variations in density c. as yet been unable to explain the cyclic changes in hare density d. shown that multiple factors, such as raptor predation and plant interactions produce oscillations even in the absence of lynx
DNA and RNA are alike in
a. the pentose sugar. b. all the nitrogenous bases used to assemble the genetic code. c. the number of strands. d. their function in genetics. e. none of these.