B) False
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A) Producing the enzymes that synthesize tryptophan is metabolically expensive,so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary.
B) Producing high levels of tryptophan inhibits the production of other amino acids,so inhibiting its production allows all amino acids to be synthesized at equal concentrations.
C) High levels of tryptophan causes cells to become unresponsive to external stimuli,so its production must be regulated.
D) High levels of tryptophan inhibit cellular respiration and the synthesis of ATP,so its production must be regulateD.
E) All of these choices are TRUE.
G) C) and D)
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B) False
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B) False
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B) False
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A) Bacterial gene expression will increase because both prokaryotic and eukaryotic genes are based on the same four nucleotides.
B) Bacterial gene expression will not occur because RNA polymerase enzymes between prokaryotes and eukaryotes are incompatible.
C) Bacterial gene expression will increase because eukaryotic RNA polymerase has analogous function to prokaryotic RNA polymerase.
D) Bacterial gene expression will decrease slightly because prokaryotic RNA polymerase cannot transcribe eukaryotic genes as efficiently as prokaryotic genes.
F) A) and D)
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B) False
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A) A-B and B-C
B) A,B,and C
C) A-B-C
D) A-C
E) All of these would be found in the pool.
G) D) and E)
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A) transcription factor
B) inducer
C) repressor
D) mediator
E) RNA polymerase II
G) All of the above
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A) Lac operon gene expression will decrease until glucose concentrations drop.
B) Lac operon gene expression will increase until glucose concentrations drop.
C) Lac operon gene expression will permanently glucose,regardless of lactose concentration.
D) Lac operon gene expression will permanently increase,regardless of glucose concentration.
F) A) and D)
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A) The cell could experience an ideal balance of proteins that might affect cellular function.
B) The cell would not be affected because no protein changes would occur.
C) The cell would experience increased function because having more of a protein is always an improvement.
D) The cell would likely have more and less protein at different times that would affect cellular function.
F) A) and B)
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A) Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon.
B) Expression of lac structural genes on the plasmid,but not the chromosome,will increase because the mutation in the chromosomal lacO gene will prevent the expression of the genes.
C) Expression of lac structural genes on the chromosome but not the plasmid will increase because repressor proteins are unable to bind to the chromosomal lacO site,but are capable of binding the plasmid lacO site.
D) Expression of lac structural genes will not change because the lacO site is not a structural gene.
F) C) and D)
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A) glucose.
B) cAMP.
C) tryptophan.
D) CAP.
E) lactosE.
G) A) and D)
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A) polyintronic mRNA.
B) polyextronic mRNA.
C) polycistronic mRNA.
D) polyexpressive mRNA.
E) polyrepressor mRNA.
G) A) and D)
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A) are always present in the cytoplasm.
B) are only found in the nucleus of the cell.
C) regulate gene transcription by binding to DNA.
D) regulate gene transcription by binding a regulatory protein.
F) All of the above
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A) The transcriptional start site may not function properly.
B) Transcription may start at a variety of sites.
C) Unusable transcripts may be produced.
D) The preinitiation complex may form at the wrong site.
E) All of the choices are correct.
G) A) and D)
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A) Binding of RNA polymerase could be hindered,so transcription would be repressed.
B) Binding of a repressor protein could be hindered,so transcription would be active.
C) Binding of the activator protein could be hindered,so transcription would be repressed.
D) Binding of the sigma factor to RNA Polymerase would be hindered,so transcription would be represseD.
E) The order in which the genes of the lac operon are transcribed would be altered.
G) C) and D)
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A) a repressor exerting negative control
B) a repressor exerting positive control
C) an activator exerting negative control
D) an activator exerting positive control
E) a combination of both a repressor and activator exerting negative control
G) All of the above
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A) recognizes the enhancer.
B) recognizes the TATA box.
C) recognizes the silencer.
D) transcribes mRNA.
E) is a silencer.
G) A) and E)
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A) Transcription rate decreases.
B) Transcription rate increases.
C) RNA polymerase binds to the promoter.
D) RNA polymerase binds to the promoter and transcription rate decreases.
E) RNA polymerase binds to the promoter and transcription rate increases.
G) A) and E)
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