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QB_Av2key2 - BIO320 Spring 2010 Answer key for question...

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BIO320 Spring 2010 Answer key for question bank A(v2) I. THE “CENTRAL DOGMA”: DNA TO PROTEIN 1.B 2.D & E 3.E 4.B 5.A 6.B 7.A 8.B 9.A 10.A II. THE GENETIC CODE 11.A 12.D 13.B 14.E 15.A 16.B 17.C 18.A 19.C 20.D 21. E 22. The number of nucleotide sequences is larger: (4) 300 = (64) 100 >> (20) 100 . 23. B 24. C III. tRNA; CODONS AND ANTICODONS 25.D 26.E 27.D 28.E 29.D 30.C 31.D 32.C 33.A 34.B 35. C 36. B IV. RNA AND TRANSCRIPTION IN PROKARYOTES; PROMOTERS 37.D 38.B 39.A&F 40.E 41.C 42.E 43.A 44.G 45.E 46.B 47.D 48.D 49.D 50.C 51.A V. TRANSCRIPTION IN EUKARYOTES; RNA PROCESSING 52.E 53.B 54.E 55.C 56.A 1 57.A 58.D 59.D 60.E 1 : C arguably also correct, as splicing is likely coupled to transcription VI. TRANSCRIPTION + TRANSLATION: DNA TO PROTEIN 61.A 62.B 63.D 64.A 65. C 66a. 5’- AAUCGUCAGCUGAGCUGG-3’ b. -Ile-Val-Ser-COOH c. -Ile-Val-Ser-Gly-Ala-Gly- (nonsense suppressor tRNA) 67a. 5’-GCGGAUAUGGUACGGACU-3’ b. fMet-Val-Arg-Thr c. fMet-Val-Arg-Thr (coding sequence unaffected) 68. The key to this challenging question is to realize that at least one reading frame in this coding exon must be completely open - i.e., have no stop codons.
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