The diagram shows the structures of some drugs that have a similar structure to nucleotides. The presence of these drugs reduces nucleic acid synthesis.
Which statement explains how these drugs reduce nucleic acid synthesis?
1 )
Increasing the concentration of these drugs results in the increased length of the nucleic acid.
2 )
They are non-competitive inhibitors of the enzymes that catalyse the synthesis of DNA or RNA.
3 )
They bind to pyrimidine nucleotides and the base pair is the wrong size.
They replace purine nucleotides causing the synthesis of incomplete nucleic acids.
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