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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

A cnidarian, which is radially symmetrical, has ________ germ layer(s)

A) no B) one C) two D) three E) four

Biology & Microbiology

In the citric acid cycle, malate is oxidized to form

A. citrate. B. succinate. C. oxaloacetate. D. fumarate. E. malate.

Biology & Microbiology