Question

How does the enzyme know where to start and stop transcription?​

Answer 1

Explanation:

The place where the regulator binds is called the allosteric site. The left part of this diagram shows allosteric inhibition. The allosteric inhibitor binds to an enzyme at a site other than the active site. The shape of the active site is altered so that the enzyme can no longer bind to its substrate.

Answer 2

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Signals in DNA indicate to RNA polymerase where it should start and end transcription. These signals are special sequences in DNA that are recognized by the RNA polymerase or by proteins that help RNA polymerase determine where it should bind the DNA to start transcription.