C: Each nucleotide is part of a single codon.
Step-by-step explanation:
In a nonoverlapping genetic code, each nucleotide is only read as part of a single codon (a sequence of three nucleotides), which specifies a single amino acid. This means that there is no overlap or sharing of nucleotides between adjacent codons. Options A and B are incorrect because they do not accurately describe a nonoverlapping genetic code. Option A refers to reading frames, which are not related to the concept of a nonoverlapping genetic code. Option B is a true statement about the differences between DNA and RNA, but it does not describe a nonoverlapping genetic code. Option D is also partially correct, but it does not specifically describe the nonoverlapping nature of the genetic code.answer: