The microscopic air sacs or alveoli are the sites where blood
a. picks up oxygen.
b. gives up carbon dioxide.
c. gives up oxygen.
d. both a and b.
a
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A polymer with the sequence 5' ACGTACGAATAG 3' is a:
A. polysaccharide. B. protein. C. piece of RNA. D. piece of DNA. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about nucleic acid structure? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
Which of the following is a germ layer that forms the lining of the urinary, respiratory, and digestive tracts?
A) ectoderm B) endoderm C) mesoderm D) embryonic disk
All of the following are correct EXCEPT:
a) The first law of them odynamics states that energy can never be created or destroyed b) the second law of thermodynamics states that every conversion of energy is not perfectly efficient and includes the transformation of some energy into heat c) heat is one of the most useful forms of energy to living organisms
Which of the following is an example of a photoautotroph?
A) cyanobacteria in freshwater and marine ecosystems B) mushrooms growing on the side of a dead tree C) bacteria in our mouth D) fungi growing in the refrigerator E) grizzly bears in Alaska