Which of the following features of transcription initiation is least likely to contribute to the process of "abortive initiation"?
A. Early in initiation, the RNA exit channel of RNA polymerase is blocked by the polymerase itself.
B. Early in initiation, the RNA exit channel of RNA polymerase is blocked by the sigma factor.
C. The transition between the closed and open complex is energetically costly.
D. RNA is synthesized de novo, requiring no primer.
E. Early in initiation, the processivity of RNA polymerase is low.
C
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When comparing the genomes of a bacterial parasite versus a free-living, nonparasitic bacterium, one expects to find that _____
A) the proportion of G-C base pairs will be significantly higher in the parasite B) no homology between the free-living and parasitic bacteria C) there will be a higher proportion of genes of unknown function in the parasite D) the parasite will have acquired a smaller proportion of its genes through lateral gene transfer E) the parasite will have a smaller genome
A suggested explanation that might be true and is subject to testing by further observations is a(n):
A. hypothesis. B. experiment. C. scientific principle. D. generality. E. theory.
In meiosis, homologous chromosomes separate in ____
a. metaphase I b. anaphase I c. metaphase II d. anaphase II e. telophase
Benzoic acid is largely a(n) (antifungal/antiprotozoal/pickling) agent and does not affect the growth of many bacteria
What will be an ideal response?