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WorksheetsGene Regulation
Total questions: 20
Worksheet time: 13mins
All the genes in both a prokaryotic cell and a eukaryotic cell are expressed at the same time.
True
False
In order for a gene to be expressed, ___ must bind to the gene's ___, a specific sequence of nucleotides at one end of the gene, thus initiating transcription.
DNA polymerase, promotor
DNA polymerase, operator
RNA polymerase, promotor
RNA polymerase, operator
Genes can be shut off (not expressed) when a ___ binds to the ____.
activator, operator
repressor, operator
corepressor, operator
repressor, promotor
In the trp operon, __ acts as a __ and helps the repressor bind to the operator.
tryptophan, corepressor
tryptophan, inducer
lactose, corepressor
lactose, inducer
How many amino acids are coded for by this sequence of nucleotides:
ATG GGA ACT CCA
4
2
6
12
Transcription factors are responsible for
turning genes on
turning genes off
turning genes both on and off
stopping transcription
In eukaryotic cells, after transcription, the mRNA
exits the nucleus unchanged.
is processed before leaving the nucleus.
enters the nucleus.
is replicated before leaving the nucleus.
In eukaryotic cells, the ____________ are segments of mRNA that are cut out of the final transcript.
promoters
poly A tails
exons
introns
The TATA box is
a promoter in eukaryotes.
an operator in prokaryotes.
an exon in prokaryotes.
a tail in eukaryotes.
