Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?
A) G0
B) G1
C) S
D) G2
E) M
Answer: D
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The ____ are limited to three groups of proteobacteria
a. chemoautotrophs only b. chemoheterotrophs c. photoautotrophs d. photoheterotrophs only e. chemoautotrophs and photoheterotrophs
What were the long-term responses of each population following the removal of the mice? a. At about year 40, the deer mice population began to re-establish, but then crashed quicklyafter that
b. At about year 40, the deer mice population began to re-establish, and quickly grew back to itsoriginal population size. c. There was no apparent impact on any other population size. d. Both b and c above.
The photos of the Muir Glacier taken in 1941 (left) and 2004 (right) demonstrate the consequences of____
a. deforestation b. biological magnification c. acid rain d. ozone destruction e. global climate change
Transpiration occurs in:
a. the atmosphere. b. terrestrial plants. c. the ocean. d. groundwater. e. bacteria