The following events occur during transcription.
1 Bonds break between complementary bases.
2 Bonds form between complementary bases.
3 Sugar-phosphate bonds form.
4 Free nucleotides pair with complementary nucleotides.
Before the mRNA leaves the nucleus, which events will have occurred twice?
1 and 2 only
2 )
1, 3 and 4 only
3 )
2, 3 and 4 only
4 )
1, 2, 3 and 4
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