Which statements concerning DNA and RNA are correct?
1) Adenine and guanine are bases that have a double ring structure; cytosine, thymine and uracil are bases with a single ring structure.
2) An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA; DNA adenine pairs with thymine and RNA adenine pairs with uracil.
3) The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription is always according to the rule that a purine pairs with a pyrimidine.
4) The two polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other.
1 )
1, 2 and 3
2 )
1, 2 and 4
1, 3 and 4
4 )
2, 3 and 4
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