Shown below is a hypothetical DNA sequence from a virus. Also shown is the sequence of the mRNA that is synthesized from this DNA.DNA sequence:5'-AGCACCTGCCGAATGGGCCAAATCCTGCCGAATAAA-3'3'-TCGTGGACGGCTTACCCGGTTTAGGACGGCTTATTT -5'mRNA sequence (G* = G cap):5'-G*AGCACCUGCCGCCUGCCGAAUAAAAAAA....-3' The RNA was most likely transcribed by
A. RNA polymerase II.
B. RNA polymerase III.
C. RNA polymerase holoenzyme.
D. RNA polymerase I.
Answer: A
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The RNA World hypothesis isdirectly supported by all the following except:
A. catalytic RNAs. B. ribozymes showing diverse function. C. ribosome structure. D. micelle to vesicle formation.
Siderophores:
A. Are used to detoxify oxygen intermediates in bacterial growth medium B. Are proteins that can form chelating complexes to obtain iron for an organism C. Are non-reusable forms of iron produced by the liver D. Aid in energy retention in the electron transport chin E. Control the breakdown of various organic substances
A "rain shadow" describes
A) shadows cast by the mist and clouds that hover above the crest of a mountain range. B) forested conditions of mountain ranges. C) mountainous areas where dry descending air absorbs moisture and there is little precipitation. D) dark-colored chaparral vegetation that grows on the mountain ranges.
Eukaryotic cells compartmentalize some anabolic and catabolic pathways so that these pathways can be operated ________.
Fill in the blank(s) with the appropriate word(s).