In 3.a (above) you mutated one letter. What role do you think the redundancy of the genetic code plays in this type of change?

It has a role of mutation and eventual evolution in the field of genetics.

Explanation:

The changing of one letter represents whether or not the amino acid encoded by the triplet base will be affected. Redundancy in code means there are multiple codes that will be translated to the same amino acid, so a change/mutation in that position does not alter the protein produced.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.