Answer: I) Isotopes
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Answer:
The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid. Since there are 64 combinations of 4 nucleotides taken three at a time and only 20 amino acids, the code is degenerate (more than one codon per amino acid, in most cases).
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During transcription, the new mRNA is created from a single strand of a DNA template. As it elongates, it then peels away from template.