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In semi-conservative DNA replication, __________.

(A) an entirely new double helix is build using information in the sequence of amino acids.
(B) parental DNA remains intact but guides the formation of two new double helices.
(C) the parental DNA splits and free nucleotides bond to their complements, building two DNA molecules from one.
(D) parental DNA splits into small fragments and joins with newly synthesized pieces to create two double helices from one.