Explain why exact replication of dna is necessary, Biology

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Figure  shows part of a DNA molecule


(a) (i) What do the dotted lines in Figure represent?

 (ii) Name J to M.
J..............................
K..............................
L..............................
M..............................

(b) State three ways in which the structure of messenger RNA differs from DNA.

(c) Explain why exact replication of DNA is necessary.

78_DNA molecule.png


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