Four of the following characterize most prokaryotes. Which one is the exception?
a. lack of a nucleus
b. a single circular chromosome
c. cell wall
d. complex internal membranes
e. great metabolic diversity
ANSWER: d
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DNA sequencing makes use of dideoxynucleotides that ________
a. can be incorporated into a growing strand but cannot bind to the next nucleotide in the sequence b. have normal sugar-phosphate backbones but altered base structures c. carry pigment molecules in place of phosphate groups d. behave chemically exactly as normal nucleotides do but are labeled with colored pigments
A cnidarian, which is radially symmetrical, has ________ germ layer(s)
A) no B) one C) two D) three E) four
In the citric acid cycle, malate is oxidized to form
A. citrate. B. succinate. C. oxaloacetate. D. fumarate. E. malate.
Which of the following genes would most likely play a role in promoting kin selection?
A. the genes important for the development of large antlers in the caribou B. Major Histocompatibility Complex (MHC) genes -- allow mammals to recognize related individuals C. SRY -- the gene that initiates male sex determination D. wingless -- critical for the formation of wings in fruit flies