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Stem cells and Epigenetics
Gene activation
Eukaryotes
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Cards (3)
Why might transcription not occur?
Repressor
proteins can attach to the
DNA
of the
promotor
region,
blocking
the attachment site.
Why transcription may not occur?
regulator
protein may not be present
repressor
protein binds to a
regulator
protein which prevents
binding
Gene activation in eukaryotes
active
genes are
transcribed
into
mRNA.
RNA polymerase
binds to the
promotor
region to allow gene
transcription.
attachment of a
regulator
protein is required for a successful transcription
repressor
proteins may switch
off
the gene by binding to the
regulator
protein or to the
promotor
region
preventing
transcription
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