Final answer:
An insertion mutation in MUTANT #1 causes a sequence change in the DNA, affecting the codon and subsequent codons. This can lead to changes in the synthesized protein.
Step-by-step explanation:
An insertion mutation occurs when one or more nucleotides are added into the typical sequence of nucleotides in the DNA. In MUTANT #1, the insertion mutation is represented by the sequence change from 5'-UGCCAUGGUAAUAACACAUGAGGCCUGAAC-3' to 5'-UGCCAUGGUUAAUAACACAUGAGGCCUGAAC-3'. This insertion mutation affects the codon where the insertion happens and all the codons following it, resulting in a change in the synthesized protein.