The diagram represents a nucleotide containing thymine.
Which statements about this nucleotide are correct?
1 Thymine is a pyrimidine.
2 Base pairing occurs with two hydrogen bonds.
3 The carbohydrate can be ribose or deoxyribose.

1 )
1, 2 and 3
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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