When researchers wish to make multiple copies of a gene without first inserting it into a bacterium, they employ the
A. polymerase chain reaction.
B. pepsin activation reaction.
C. gel electrophoresis.
D. centrifuge.
Answer: A
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Natural selection
A. is evolution. B. is a key mechanism that causes evolution to happen. C. occurs at the population level. D. results in reproductive success. E. occurs at the population level and is a key mechanism that causes evolution to happen.
In tidal pools,
A) oxygen concentrations are usually higher during the day than during the night. B) carbon dioxide concentrations are usually higher during the day than during the night. C) salinity is usually higher during the night than during the day. D) temperature is usually higher during the night than during the day.
Use Figure 50-4 to predict on which day of a 28-day menstrual cycle estrogen levels would peak
a. 10
b. 12
c. 14
d. 18
e. 22
What was one of the pieces of evidence most critical to the discovery of DNA structure?
A. the hydrogen bonding between different nucleotides B. its composition of four different nucleotides C. the discovery of its semi-conservative mode of replication D. the backbone containing sugar-phosphate linkages E. an X-ray diffraction pattern suggesting a double helix shape