The greenhouse effect is a natural and important phenomenon because it
A) removes smog from affected areas.
B) maintains the surface temperature on Earth.
C) reverses the effect that CFCs have on the ozone layer.
D) decreases the amount of carbon dioxide in the stratosphere.
E) reverses the effects of deforestation.
B
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In a pedigree chart, a ____________ disease affects individuals every other generation.
Fill in the blank(s) with the appropriate word(s).
In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much B) half as much C) twice as much D) ten times as much
A microbe resistant to a variety of different antimicrobials is said to have (cross/drug/multiple) resistance
What will be an ideal response?
Which of the following is true about histone acetyltransferase (HAT)?
A) HATs will make the chromatin more compacted and less available to transcription regulatory proteins. B) HATs will remove acetyl groups from histone proteins. C) HATs have an overall effect of increasing the positive charges on DNA. D) HATs will add acetyl groups to DNA. E) HATs are usually linked to increasing gene expression.