A) The structural genes make products that are part of an anabolic pathway for the synthesis of tryptophan.
B) It is normally turned off if tryptophan is present.
C) Tryptophan acts as the corepressor.
D) Tryptophan binds to the repressor protein and inactivates it.
F) C) and D)
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A) Differential splicing of exons that can lead to an altered gene expression.
B) Incomplete excising of all introns from the pre-mRNA strand,leaving fragments to be joined with the exons.
C) Excising an exon from the pre-mRNA strand.
D) All of these are errors that can occur during posttranscriptional control of gene expression.
F) A) and D)
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A) occur in sex cells.
B) can be passed to subsequent generations.
C) may range from having no effect to completely inactivating protein activity.
D) All of the answer choices are true about germ-line mutations.
E) Only two of the answer choices are true.
G) C) and E)
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Answers should include,in the ...View Answer
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A) introns.
B) oncogenes.
C) transposons.
D) retroviruses.
E) exons.
G) A) and B)
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A) must be dominant to be effective.
B) is what happens in the production of sickle-cell hemoglobin.
C) is always beneficial to the organism in which it occurs.
D) can increase or decrease the expression of a structural gene.
F) None of the above
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A) gene.
B) structure.
C) controller.
D) works.
E) copy-producing.
G) A) and E)
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A) Lactose binds to the repressor,changing its shape so that it can bind to the operator and the structural genes are not expressed.
B) Lactose bind to RNA polymerase,which then binds to the promoter and transcribes the needed genes.
C) Lactose binds to the repressor,changing its shape so that it does not bind to the operator.RNA polymerase then transcribes the needed genes.
D) Lactose binds to the operon,which attracts RNA polymerase,then transcription of the needed genes occurs.
F) C) and D)
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B) False
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