Both Beggiatoa and the purple sulfur bacteria use H2S. These bacteria differ in that Beggiatoa
A) uses H2S for an energy source.
B) uses H2S for a carbon source.
C) uses light energy.
D) belongs to the gammaproteobacteria.
E) is a heterotroph.
A
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If transcription of this gene occurs from left to right in the accompanying diagram, which DNA strand is the coding (non-template) strand?
A) impossible to determine B) B C) C D) D E) E
A tRNA in the P site of the ribosome will enter the ______ site after translocation of the ribosome
A) E B) A C) 3? D) 5? E) initiation
Duplicated centrioles move to opposite poles of a dividing ____ cell during the ____ of the cell cycle
a. plant; metaphase b. plant; anaphase c. prokaryotic; metaphase d. animal; interphase e. animal; prophase
Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink
Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time? A) The percentage of pink flowers should increase over time. B) The percentage of white flowers should increase over time. C) The distribution of flower colors should not change. D) The distribution of flower colors should randomly fluctuate over time.