The troph of the motile T. vaginalis organism measures 7 to 23 m long and 5 to 15 m wide. The recommended treatment of choice for this urogenital infection is:
a. tetracycline.
b. metronidazole.
c. penicillin.
d. ketoconazole.
B
Metronidazole is recommended for the treatment of urogenital trichomoniasis, although resis-tance to both metronidazole and other nitroimidazoles has been reported. T. vaginalis is pear-shaped and measures 7 to 23 m long (averaging 13 m) and 5 to 15 m wide.
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Which of the following basic features of transcription is NOT shared by both prokaryotes and eukaryotes?
A. Both prokaryotic and eukaryotic genes have a promoter site. B. RNA polymerase transcribes genes in both prokaryotes and eukaryotes. C. Gene transcription involves initiation, elongation, and termination in both prokaryotes and eukaryotes. D. The complexity of protein components involved in transcription is similar for both prokaryotes and eukaryotes. E. The initiation of transcription in both prokaryotes and eukaryotes involves the interactions of more than one protein.
Ulcers are caused by the bacterium ____
a. Escherichia coli b. Helicobacter pylori c. Bacillus anthracis d. Streptococcus mutans e. Staphylococcus aureus
Tiny molecules of dna that infect plants
What will be an ideal response?
In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits b. introns are spliced out and combined to form complete proteins c. introns are spliced out and combined in the tRNA d. exons are spliced out and the introns are combined in the mature mRNA e. introns are spliced out and the exons are combined in the mature mRNA