Which of the following devices is used for PCR?
A) an electrophoresis chamber
B) a gene gun
C) a DNA sequencer
D) a thermocycler
E) a nucleic acid synthesis machine
D
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The volcanic oceanic island of Krakatoa is located in Indonesia. In 1883, this island experienced a massive volcanic explosion that killed most of the plants and animals living on the island
For the following set of organisms, indicate the order in which you would expect the number of species on the island to return to the pre-eruption equilibrium number. A. lizards, birds, butterflies, beetles B. birds, lizards, butterflies, beetles C. birds, butterflies, lizards, beetles D. birds, butterflies, beetles, lizards
In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases
upstream from the first structural gene. __________________ Indicate whether the statement is true or false.
The fish in a certain population average 10 millimeters in length. Imagine that a population of predatory birds arrives in the area, but they cannot eat fish longer than 15 millimeters. After a decade, if the fish average 14 millimeters in length, what probably happened?
A) There was disruptive selection for fish length. B) The presence of the predator caused mutations for larger fish to occur. C) The longer fish survived and produced more offspring than shorter fish. D) There was stabilizing selection for fish length. E) The fish and the predator coevolved.
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Figure 33.17
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Use the accompanying figure to answer the following question.
The retina is indicated by the letter ____.
A. A B. B C. C D. D E. E