Adaptive radiation might be expected after which of the following events?
a) a mass extinction
b) colonization of a new area
c) evolution of a new feature, like the amniotic egg
d) All of the above are true.
e) Only a) and c) are true.
Ans: d) All of the above are true.
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Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. helix. B. ribbon. C. hollow cylinder. D. pleated sheet. E. icosahedron.
Vibrio cholerae lives in water and gets toxin genes from a virus by phage conversion. The toxin kills the intestinal epithelial cells in the human host, resulting in massive diarrhea. Untreated cholera has about a 50% mortality rate. How do the bacteria benefit?
A. Diarrhea helps the bacteria to spread from person to person. B. Killing humans provides nutrients for the bacteria. C. They don’t -- humans are not the main host and their symptoms are maladaptive for the bacteria. D. The bacteria reproduce faster in a dead human. 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 cholera? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
To assign absolute dates to fossils in this sediment core, it would be most helpful if _____
A) we knew the order in which the fossils occurred B) the sediments had not been affected by underwater currents during their deposition C) volcanic ash layers were regularly interspersed between the sedimentary strata D) fossils throughout the column were equally spaced apart
examples of carbohydrate monosacharides
What will be an ideal response?