Final answer:
DNA mutations alter sequences and change resultant mRNA and protein structures, creating differences in three mutated DNA strands.
Step-by-step explanation:
Three mutated strands of DNA differ due to altered DNA sequences, leading to variations in mRNA transcribed from the template, and consequently the amino acid sequence of the resulting peptide. DNA structure is a helix with adenine-thymine and cytosine-guanine pairs, but mutations might change these pairings, causing differences in the resulting proteins.
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