During semi-conservative replication of DNA in eukaryotic cells, the following processes occur.
1 Free nucleotides are hydrogen bonded to those on the exposed strand.
2 Hydrogen bonds are broken between the complementary base pairs.
3 The cell receives the signal to begin to divide.
4 Covalent bonds form between adjacent nucleotides on the same strand.
5 The DNA double helix is unwound.
Which shows the correct order of some of the processes?
1 )
$3 \to 1 \to 2 \to 4$
2 )
$3 \to 2 \to 4 \to 5$
$5 \to 2 \to 1 \to 4$
4 )
$5 \to 2 \to 3 \to 1$
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