Restriction endonucleases were discovered by ________.
A. Arber and Smith
B. Jackson, Symons, and Berg
C. Temin and Baltimore
D. Boyer and Cohen
Answer: A
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DNA supercoils that result from overwinding produce ____ supercoils
Fill in the blank with the appropriate word.
In hydrothermal vent communities, autotrophic organisms obtain energy by oxidizing
A) reduced sulfur compounds. B) carbon dioxide. C) sodium chloride. D) metals such as copper and iron.
During aerobic respiration, oxygen is:
a. formed. b. reduced. c. oxidized. d. catabolized. e. decarboxylated.
No two people are genetically identical, except for identical twins. The chief cause of genetic variation among human individuals is
A) new mutations that occurred in the preceding generation. B) the reshuffling of alleles in sexual reproduction. C) genetic drift due to the small size of the population. D) geographic variation within the population. E) environmental effects.