Why do scientists repeat their experiments over and over again?
a. They never get it right the first time.
b. They can never be sure what procedural steps they followed the first few times.
c. They must make sure the results were not an accident and that they are repeatable.
d. They simply have extra time and resources that must be used.
Ans: c. They must make sure the results were not an accident and that they are repeatable.
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Which of the following sigma factors would be expected to associate with RNA polymerase after increasing the incubation temperature of an E. coli culture from 30°C to 42°C?
A. ?28 B. ?32 C. ?38 D. ?42 E. ?54
Waste products of metabolism tend to accumulate in:
a. open ocean areas. b. coastal waters. c. small enclosed bodies of water. d. fast circulating water. e. major ocean currents.
Which of the following arose before all of the others listed here?
a. crocodiles b. lizards c. turtles d. snakes
What percentage of the earth is covered by
deserts?
a. 7% b. 12% c. 18% d. 20% e. 26%