Oxygen is toxic to
A) obligate anaerobes.
B) obligate aerobes.
C) cancer cells.
D) facultative organisms.
E) All of the above.
Answer: A
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Two organisms containing identical GC ratios are not necessarily related
Indicate whether the statement is true or false.
Selecting for transformants involves
A. identifying organisms that have taken up recombinant DNA. B. searching for RNA. C. production of proteins. D. production of DNA.
Which of these nutrients are likely to be required for nitrogen fixation? (check all that apply)
_____ Nitrogen _____ Hydrogen _____ Sulfur _____ Phosphorus _____ Oxygen _____ Chlorine
What is a consequence of the fact that the chickenpox virus has a much lower mutation rate than the influenza virus?
A. Chickenpox virus can "hide out" as latent virus in nerve cell bodies, but influenza cannot. B. Chickenpox creates skin lesions, while influenza leads to body aches. C. Chickenpox virus can reemerge decades later with the symptoms of shingles, while influenza is transient. D. A chickenpox infection generally gives immunity against a repeat infection, but people can catch the flu every year. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about viral mutation rates? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?