34. A benefit of eukaryote genes, each regulated by their own promoters, is that

Question

34. A benefit of eukaryote genes, each regulated by their own promoters, is that it A. coordinately activates or represses genes that encode functionally related enzymes. B. provides maximum flexibility in choosing which genes are activated or repressed C. prevents transposons from inserting and disrupting gene expression. D. maximizes the number of translated proteins E. All of the above. by creating additional alternative splicing sites 35. i n E. coli, a loss-of-function mutation in the trp repressor gene results in transcription of tryptophan biosynthesis genes only when A. tryptophan is absent from the growth media. B. tryptophan is present the growth media. C. tryptophan is absent AND glucose is PRESENT in the growth media. D. tryptophan is absent AND glucose is ABSENT in the growth media. E. both A and B. 36. In yeast (eukaryote), RNA polymerase II A. Can bind DNA and initiate transcription for most genes B. Cannot bind DNA by itself and requires the assistance of general transcription factors for low, basal gene transcription. C. Cannot bind DNA by itself and requires the assistance of specific (regulatory) transcription factors for low basal gene transcription D. can bind and transcribe tRNA genes without the assistance of general transcription factors E. can bind and transcribes rRNA genes without the assistance of general transcription factors 37. Alternative splicing A. produces alternative DNA versions of the same eukaryote gene B. produces alternative mRNAs from the same eukaryote gene. C. produces polycistronic RNA from the same eukaryote gene. D. does not exist in eukaryotes such as mammals E. both B and C. 38. A miRNA is guided to its target mRNA because A. they have the same sequences B. they have complementary sequences C. they are encoded in an operon. D. they covalently bond to each other E. All of the above. 39. Suppose a miRNA gene is no longer transcribed because of a mutation in its promoter. In mutant cells you would expect to see the number of the proteins encoded by its target mRNAs to A. stay the same B. the change in the number of target mRNAs cannot be predicted D. E. increase. decrease. All of the above. 40. Very soon after a retrovirus infects a cell, its RNA genome is A. transcribed to make proteins B. replicated to make double-stranded RNA by an RNA-dependent RNA polymerase. C. converted into double-stranded DNA by reverse transcriptase. D. buds off to form a new retrovirus

Explanation / Answer

34.e

35.e

36.b

37.e

38.b

39.c

40.c

38

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