Cell fusion experiments showed that fusion of a cell in S phase with one in G1 phase leads the nucleus that was in G1 to begin S phase. The best interpretation of this finding is that_____.A. the DNA polymerase in the nucleus of the S cell moved tothe G1 nucleus and started DNA replicationB. the G1 nucleus senses the plasma membrane fusion eventand then enters S phaseC. the cytoplasm of the S cell contains a diffusible signal that causes the G1 nucleus to enter S phaseD. the cytoplasm of the G1 cell contains a diffusible signal that causes the S nucleus to continue S phase

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