The cell would not be able to produce any proteins if a mutation occured in a promoter region of a gene ,such that it was no longer recognized by RNA polymerase.
What is mutation and its cause ?
A mutation is a change in the DNA sequence of an organism. Mutation can result from errors in DNA replication during cell division ,exposure to mutagens or a viral infection.
Mutation result either from accident during the normal chemical transaction of DNA ,often during replication or from exposure to high energy radiation.
Mutation in the the promoter resulted in a change in DNA binding pattern of the AP-2 transpiration factor.
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