The adenine bases in a DNA molecule are radioactively labeled. Once this DNA molecule had replicated twice to form four new DNA molecules with no other labeled adenine bases present, you would find the labeled adenine

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During DNA replication, each original strand serves as a template for a new strand. After the first replication, each DNA molecule consists of one labeled and one unlabeled strand. After the second replication, each of these strands serves as a template again, resulting in two labeled and two unlabeled strands among the four new DNA molecules. Thus, labeled adenine is found in two of the eight strands.

The Adenine Bases in a DNA Molecule Are Radioactively Labeled