Encouraging the growth (via nutrient fertilization) of photosynthetic protists in marine environments may help reduce global warming because _____
A) photosynthetic protists are primary consumers in many marine food chains
B) photosynthetic protists fix atmospheric carbon dioxide, decreasing atmospheric carbon dioxide levels
C) the increased oxygen consumption by large populations of photosynthetic protists will increase photosynthesis in land plants
D) photosynthetic protists would release a lot of oxygen, and fertilizing them would increase levels of oxygen in the atmosphere
Answer: B
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Activation of the IFN-? globin promoter is an example of a histone code. Of the steps given, which is the third in this process?
A. The TATA box in the promoter is exposed. B. Complexes containing Gcn5 bind to the promoter and acetylate nearby nucleosomes. C. A chromatin remodeling complex such as SW1/SNF binds to and moves the nucleosome. D. Initiation of transcription occurs. E. A protein kinase binds to the Gcn5 complex and phosphorylates nearby nucleosomes.
Which of the following types of chromosomal mutation cannot revert to the wild-type state?
A) Duplication B) Deletion C) Translocation D) Inversion E) Any of these may revert to wild-type
Gene flow is restricted between subspecies because of some extrinsic barrier, such as rivers or mountain ridges
Indicate whether the statement is true or false
On the Galapagos Islands, Charles Darwin questioned why:a
the island species resembled those on other arid islands. b. the island species resembled those from nearby islands. c. the islands were inhabited at all since they were 600 miles from South America. d. the island species resembled those from South America. e. the island species were not unique