Death cap mushrooms produce a substance called alpha-amanitin. Alpha-amanitin efficiently blocks synthesis of mRNA, but not of tRNA or rRNA in eukaryotic organisms. This is possible because alpha-amanitin efficiently interferes with _____
A) the action of RNA polymerase I, but not RNA polymerase II or III
B) RNA polymerase III, but not RNA polymerase I and II
C) the action of one or more basic transcription factors
D) the action of RNA polymerase II, but not RNA polymerase I or III
Answer: D
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A computer program recognizes an ORF by looking for ribosomal binding sites, start codons, and stop codons with an appropriate number of nucleotides between each element. What is a drawback of this approach?
A) Too many ORFS are identified, most of which are stretches on non-coding junk DNA. B) Codon bias causes incorrect annotations. C) Unusual, but legitimate genes and non-coding RNA may be missed. D) We lack the computing power to complete the analyses in a timely manner, thus many genomes are only partially annotated.
Bipedalism is most highly developed in
a. hominoids. b. apes. c. humans. d. monkeys. e. prosimians.
Which of the following bacterial genera is useful for sewage treatment?
A) Burkholderia B) Thiobacillus C) Neisseria D) Zoogloea E) Nitrosomonas
When spores are released from the underside of the fern frond, they fall to the ground where they germinate, growing into
A. haploid gametophytes. B. diploid gametophytes. C. haploid sporophytes. D. diploid sporophytes.