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1. |
Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that |
A. | only one chromatid of a chromosome was labeled |
B. | both chromatids of a chromosome were labeled |
C. | both (a) and (b) |
D. | neither chromatid was labeled |
Answer» C. both (a) and (b) | |