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Electrical Engineering

Are all genes expressed at the same time in all cell types?

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Are all genes expressed at the same time in all cell types?
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No- genes are expressed at different times or in different cells types.
There are several sequences in DNA that regulate when a genes is transcribed,
such as- promoters and enhancer sequences which control binding of polymerases
to start transcription and operator sequences that allow for external proteins to
cause activation or repression.
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