Major air masses rise from Earth's surface at:
a. the equator and 30 degrees latitude
b. 30 degree and 60 degree latitudes
c. the equator and 60 degrees latitude
d. 30 degrees latitude and the poles
e. the poles.
c
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Hfr cells are bacterial cells that ____
a. perform meiosis b. have the F factor integrated into their chromosome c. maintain the F factor in a plasmid d. have a low frequency of recombination e. have received DNA from a bacteriophage
The dominant land plants during the Mesozoic era, from about 250 million years ago to 65 million
years ago, were ____.
a. lycophytes b. ferns c. gymnosperms d. bryophytes e. angiosperms
Most of the carbon now present in the earth's
atmosphere will eventually end up in what two reservoirs? a. plants and animals b. plants and decomposers c. plants and soil d. plants and oceans e. plants and fossil fuels
Peptides and small proteins are generally too large to be transported into cells using transport proteins or by moving through pores. The macromolecules are brought into the cell using
A) diffusion. B) exocytosis. C) gated channels. D) endocytosis. E) open channels.