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How many of eukaryotic RNA polymerase subunits are common for all three polymerases?

How many of eukaryotic RNA polymerase subunits are common for all three polymerases? Correct Answer 5

The beta, beta prime, two alpha and one omega subunit homology to eukaryotic RNA polis common in all three RNA polymerases. These are RPA 1-5 respectively. The rest subunits are non-essential or dispensable.

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