A mutation in mRNA that affects the production of proteins means that the protein produced will have a different identity than that present in the first option.
The mutation can happen in many ways, such as through radiation, chemicals, etc., and when the mutation happens in the mRNA that carries the message of DNA in the form of nucleotides, it changes the shape and capacity to express the function of that protein.
Hence, a mutation in mRNA that affects the production of proteins means that the protein produced will have a different identity than that present in the first option.
Learn more about the mRNA and mutations here.
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