Z-DNA is the type of DNA that is a left-handed helix. It is also known to be biologically active in zigzag formations of repeating base pair sequences. Z-DNA has 12 base pairs per turn, so it carries the most genes between each turn. Z-DNA plays a role in RNA transcription, which is the protein synthesis process of creating mRNA from a strand of DNA. mRNA (message RNA) is the molecule that carries transcribed genes to ribosomes where proteins are synthesized.
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