Exhalation _____
a. is always active
b. is always passive
c. may be both active and passive
d. compresses alveoli
e. may be both active and passive, and compresses alveoli
ANSWER: e
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The hypothesis that species diversity is greater at lower latitudes than higher latitudes because low-latitude habitats are older would be supported if:
A. speciation rates were the same at high and low latitudes. B. speciation rates were higher at low latitude than at high latitude. C. speciation rates were higher at high latitude than at low latitude. D. speciation rates were more variable at high latitude than at low latitude. E. speciation rates were more variable at low latitude than at high latitude.
During prokaryotic cell division, two chromosomes separate and are distributed to the two ends of the cell by ____
a. the action of the mitotic spindle b. an unknown mechanism c. attachment to actin d. attachment to separating membrane regions e. formation of a newly made cell wall
Which of the following types of plants dominate most of the earth's land areas today?
a) lycophytes b) gymnosperms c) bryophytes d) pterophytes e) angiosperms
Methylene blue can be used to stain DNA because
A. DNA is negatively charged. B. changes the pH and therefore the structure of DNA. C. covalently bonds with DNA. D. makes DNA electron dense. E. is an effective fixing agent for nucleic acids.