The diagram represents a nucleotide containing adenine.Which statements about this nucleotide are correct?
1) The carbohydrate is a pentose.
2) The base contains nitrogen.
3) Base pairing occurs with uracil.
4) Adenine is a pyrimidine.

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