A eukaryotic ribosome stalled by a non-stop mutation can be rescued by:
A. nonsense-mediated mRNA decay.
B. non-stop mRNA decay.
C. recruitment of release factors.
D. degradation of the ribosome.
A student dispensed three identical samples of closed circular DNA to three test tubes. Tube A served as a control. Both tubes B and C received equal amounts of type I topoisomerase; however, the reaction in tube C was allowed to incubate longer.
When the contents of all tubes were run on a gel, all tubes showed supercoiled DNA with equally minimal amounts of relaxed DNA. The best conclusion the student should make is that the topoisomerase:
A. catalyzed the reaction so efficiently, the extra time for tube C wasn't required.
B supercoiled the DNA efficiently.
C. the topoisomerase relaxed the DNA efficiently.
D. was denatured and not working properly.
E. was type II, not type I.
Which of the following RNA products are least likely to be synthesized by RNA polymerase II eukaryotic cells?
A. noncoding RNAs
B. microRNA
C. mRNA
D. tRNA
E. None of the choices given is a RNA polymerase II product.
Which of the following is a Wnt pathway membrane protein?
A. Wnt
B. Dsh
C. frizzled
D. Hedgehog
The function of tmRNA in bacteria is to:
A. rescue stalled ribosomes.
B. terminate translation at all stopcodons.
C. initiate translation at special start codons.
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