Planting trees can combat global warming because
a) photosynthesis from those trees absorbs O2, a greenhouse gas, from the atmosphere
b) photosynthesis from those trees absorbs CO2, a greenhouse gas, from the atmosphere
c) photosynthesis from those trees will produce carbohydrates that can be used as a greenhouse-gas-free fuel
d) in the process of photosynthesis, the leaves of those trees will intercept photons from the sun, thus reducing the amount of heat reaching the earth
e) the shade from the leaves of the trees will cool the earth
Answer: b) photosynthesis from those trees absorbs CO2, a greenhouse gas, from the atmosphere
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How does azidothymidine (AZT) fight AIDS?
A. It targets the virus for destruction. B. It blocks the enzyme that assembles all of the RNA proteins into new HIV viruses. C. It blocks the virus from entering the cell. D. It blocks the enzyme that converts viral RNA to DNA (called reverse transcriptase, or RT).
Meiosis in flowering plants gives rise to cells that are
a. haploid gametophytes. b. diploid sporophytes. c. sporophytes that can be haploid or diploid. d. diploid gametophytes. e. haploid sporophytes.
The first humans appeared in the fossil record in the _____
a. paleocene b. eocene c. oligocene d. miocene e. pleistocene
The process of segregating the daughter chromosomes in Sulfolobus is more similar to the process in eukaryotic cells than in bacterial cells.
Answer the following statement true (T) or false (F)