23. which of the following soquences would be recognized by a tormination factor

Question

23. which of the following soquences would be recognized by a tormination factor during translation? A) 5 UGA 3 B) 5' AUG 3 C) 5'AAA3 D) 5'AUA 3 E) 5'AAG 3 24. Serine is an amino acid with a side chain of -CHa-OH. As a polypeptide chain folds into the final protein shape, where would you predict serine to be located in the final three-dimensional structure of the p A) Buried deep in the folds of the proboin B) Tightly bound in a hydrophobic pocket of the protein oteln? C) In a region of the protein exposed to the aqueous surroundings D) A and B E) None of the above 25. Working in the laboratory, you isolate a sample of chromatin from a eukaryotic cell nucious the sample of chromatin into A) Two long strands of DNA plus assorted proteins B) A single circular plece of DNA C) Two long strands of DNA, with no protoins D) Histone proteins only E) None of the above its oomponent parts. The sample would contain which of the following: 26. Which of the following best describes the order and timing ot events for transiation A) Large and small ribosomal subunits assemble. mRNA molecule is threaded between them sequence interacts with small subunit Methionine-charged tRNA binds to AUG. Translation B) Large ribosomal subunit interacts with Shine-Delgano sequence on mRNA. Methionine-charged tRNA binds to Methionine-charged tRINA binds to AUG. Large subunit assembles on the mRNA. Translation proceeds C) Small ribosomal subunit interacts with Shine-Delgamo sequence on mRNA. AUG. Large subunit assembles on the mRNA. Translation proceeds. D) Methionine-charged tRNA binds to large ribosomal subunit. mRNA molecule binds to small subunit. Large subunitIRNA complex associates with small subunit/mRNA complex. Translation proceeds. E) Small ribosomal subunit interacts with Shine-Delgarno sequence on mRNA Uncharged tAINA binds to AUG Large subunit assembles on the mRNA. Methionine charges tRINA. Translation proceeds. 27. Given the tollowing sequence 5'-GCATGT- 3', the notation 3' refers to a free hydroxyl group on deoxyribose at position 3 on the ring. B) A) a free hydroxyl on cytosine at position 3 on the ring. C) a free phosphate group on deoxyribose at position 3 in the ring D) a free phosphate group on cytosine at position 3 in the ring 28. How do the riboses of RNA and DNA differ? RNA has a six-carbon sugar; DNA has a five-carbon sugar B) The sugar of RNA has a hydroxyl group that is not found in the sugar of DNA A) RNA contains uracil; DNA contains thymine. C) D) DNA's sugar has a phosphorus atom; RNA's does not. 29. Bacteria are grown on medium containing "5N until all of their DNA is labeled. They are then grown on a medium containing 14N for three generations and the DNA examined by density gradient centrifugation. What pattern would be predicted for a semi-conservative mode of replication? A) All DNA will be of an intermediate in density B) 1/2 will be light and 1/2 will be heavy C) 1/4 will be light and 3/4 will be intermediate. D) 1/4 will be intermediate and 3/4 light. E) All will be light Page 4 of 8

Explanation / Answer

23-A) 5' UGA 3'

24- C) In a region of protein exposed to the aqueuos surroundings.

25-A) Two long strands of DNA and assorted proteins

26- C)

27- A)

28 - B)

29 - C)

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