21. The completion of the S phase of the cell cycle of a mammalian cell is marked by all of the following EXCEPT:
(A) Histone content per cell is double that of cells in G1•
(B) In replicated DNA, newly incorporated bases are paired with parental bases.
(C) Each replicated chromosome has four telomeres.
(D) Sister chromatids disjoin from one another.
(E) The nucleus contains the equivalent amount of DNA of a tetraploid cell in G1•