Isomers are two or more molecules with ____ chemical formula and ____ molecular structures
a. a different; different
b. the same; different
c. a different; the same
d. the same; the same
e. a structural; theoretical
ANSWER: b
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The process of transcription in eukaryotes ends when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
AIDS, warts, and measles are caused by
A. bacteria. B. viruses. C. protozoa. D. fungi.
The most precise method of obtaining estimates of the absolute ages of geological deposits is to
A. apply the principle of superposition (younger deposits above older deposits). B. measure the ratios of various radioactive isotopes in the deposits. C. measure rates of sedimentary rock formation. D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
With evolution as the core theme of biology, we can explain traits shared by organisms as evidence of ________ and traits that differ among organisms as evidence of ________.
Fill in the blank(s) with the appropriate word(s).