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(A) Radioactive thymidine is a precursor for $DNA$ synthesis. During the $S$-phase of the cell cycle,$DNA$ replication occurs. Euchromatin is the loos

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Euchromatin

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(A) Radioactive thymidine is a precursor for $DNA$ synthesis. During the $S$-phase of the cell cycle,$DNA$ replication occurs. Euchromatin is the loosely packed,transcriptionally active region of chromatin that replicates early during the $S$-phase. Heterochromatin is the tightly packed,transcriptionally inactive region that replicates late during the $S$-phase. Therefore,the radioactivity will first be observed in the euchromatin.

If a dividing cell is placed in a medium containing radioactive thymidine,the radioactivity will first be observed in:

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