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The RNA polymerase holoenzyme in prokaryotes consists of two $\alpha$ subunits, one $\beta$ subunit, one ${\beta}^{\prime}$ subunit, one $\sigma$ subunit, and one $\omega$ subunit.

Which of these subunits is absent in the RNA polymerase core enzyme responsible for elongation of a growing RNA strand?

A

The $\alpha$ subunits.

B

The $\beta$ subunit.

C

The ${\beta}^{\prime}$ subunit.

D

The $\sigma$ subunit.

E

The $\omega$ subunit.

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