In which period was a mass extinction event least likely?
a. Permian
b. Neogene
c. Cretaceous
d. Ordovician
e. Devonian
ANSWER: b
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Which of the following is an example of a reporter gene?
A) The linkers that are attached to RNA molecules to perform RNA-Seq B) The lacZ coding sequence under the control of a prokaryotic promoter C) The DNase I enzyme used to digest DNA for a footprint assay D) A human protein expressed under the control of a prokaryotic promoter
Following S phase, a human cell would have how many pairs of sister chromatids and individual DNA molecules?
A. 23 pairs of sister chromatids and 92 individual DNA molecules B. 46 pairs of sister chromatids and 46 individual DNA molecules C. 46 pairs of sister chromatids and 184 individual DNA molecules D. 46 pairs of sister chromatids and 92 individual DNA molecules E. 23 pairs of sister chromatids and 46 individual DNA molecules
Which of the following weather conditions would you expect to have the greatest negative impact on the sexual reproduction of ferns and mosses?
A) Above-average temperatures for several days B) The shade of a forest C) Moderate temperatures and rainfall D) Excessively wet and rainy E) Excessively dry for several days
Which of the following statements about the resting potential is true?
A) All of the listed responses are correct. B) The neuron's plasma membrane is much more permeable to sodium than to potassium. C) The concentration of sodium is much higher inside the cell than outside. D) Inside the cell, the concentration of potassium is much higher than the concentration of sodium. E) The chloride-hydrogen pump plays a role in maintaining the resting potential.