25) In an unprocessed newly synthesized cukaryotic protein which is true a) the

Question

25) In an unprocessed newly synthesized cukaryotic protein which is true a) the N terminus is encoded by sequences in the 5" region of the mRNA b) the C terminus is encoded by sequences in the 5" region of the mRNA c) the first amino acid is always formyl-methionine d) the last amino acid is always encoded by the codon AAA e) a and e 28) Which transcription factor is nocessary for clongation a) TFIID b) TFIIH c) TFIIA d) TFIIE e) TFIIF 29) The eukaryotic equivalent of the sigma factor is a) TFIID b) TFIIH c) TFIIA d) TFIIE e) TFIIF 30) Which is not needed in gencrating a cDNA library from eukaryotes a) mRNA b) SI nuclease c) Reverse transcriptase d) polyT primer e) Restriction endonuclease f) none of the above 32) What possible effect would promoter up mutations have on lac operon regulation? a) transcription is independent of lactose presence or absence b) transcription is independent on glucose presence or absence e) transcription d) transcription is independent of CAP/cAMP presence or absence e) a and c ) b and d g) none of the above i independent of the lacl repressor presence ar 33) Which is false concerning the trp opcron? a) When there is no charged tryptophanyl tRNA region 2 and 3 pair causing antitermination of trp leader sequence b) When there is charged tryplophanyl tRNA region 3 and 4 pair causing termination of tp leader c) When starved for other amino acids region 1 and 2 pair, so do regions 3 and 4 pair causing termination of trp leader sequence transcription d) tryptophan acts as a co- repressor, binds to the trp repressor and together they prevent transcription of the trp operon e) a and b 0 e and d

Explanation / Answer

25) e

28)e

29)c

30)d

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