The DNA molecule usually is made up of how many
strands?
a. 1
b. 2
c. 3
d. 6
e. 12
Answer: b
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The American redstart (Setophagaruticilla) is in serious decline. Scientists have been able to correlate health and breeding success to levels of 13C in their blood (a chemical signature indicating the source of their diet). Birds with lower levels of 13C in their blood return to their spring breeding ground sooner, weigh more and produce more offspring. Based on this, what would you expect to find in the wintering grounds of the American redstart? Check all that apply.
_____ Limited availability of habitat in areas where plants have low13C. _____ Higher insect biomass in areas where plants have low13C. _____ A lack of territorial behavior being displayed by American redstarts. _____ Differences in food quality correlating with levels of 13C in the habitat. _____ Similar flora and fauna in all redstart habitats, unrelated to levels of 13C. 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 habitat loss and songbirds? 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?
How did Bayliss and Starling demonstrate that the small intestine secretes chemical signals that stimulate the pancreas to respond to acid?
A. They injected acid into a dog's small intestine after dissecting away all the nerves. B. They exposed a dog's small intestine to a cell extract made from a second dog's small intestine that had been exposed to acid. C. They cut out a piece of the small intestine and exposed it to acid. D. They injected pancreatic secretions from a dog previously exposed to acid into the small intestine of a second dog. E. They injected acid into the pancreas after removing all of its innervation.
Greenhouse gases contribute to global warming by absorbing UV radiation. Indicate whether the statement is true or false
Which of the following statements apply to freshwater fish?
A) They lose water by osmosis. B) The concentration of solutes in their internal fluids is lower than in the surrounding water. C) They pump out ions via the gills. D) They produce dilute urine.