Which of the following is a correct sequence of events in the history of life on Earth?
A) prokaryotes, photosynthesis, eukaryotes, land organisms
B) Cambrian explosion, multicellular organisms, photosynthesis, eukaryotes
C) aquatic organisms, photosynthesis, RNA world, land organisms
D) prokaryotes, eukaryotes, land animals, land plants
Answer: A
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Diploid cells of the fruit fly Drosophila have ten chromosomes. How many chromosomes does a Drosophila gamete have?
a. 1 b. 2 c. 5 d. 10 e. 20
This circular piece of DNA is an example of a vector that is used to carry DNA into bacterial cells.
A. restriction fragment B. library C. variable number tandem repeat D. plasmid
What happens to the oxygen that is used in cellular respiration?
A. It is converted to carbon dioxide. B. It is used to make Krebs cycle intermediates. C. It is used to make glucose. D. It is reduced to form water. E. It is converted to acetyl-CoA.
Adult stem cells offer an alternative to embryonic stem cells, but they
A. do not live long enough. B. have insufficient DNA. C. are difficult to identify. D. will not join easily with a vector.