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I'm thinking the answer is RNA. Is that right?

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  • $\begingroup$ You could improve your question by editing it to add why you think/thought the answer was RNA. $\endgroup$ – Arsak Jan 24 '18 at 9:38
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Almost always DNA. While RNA is possible, it’s much harder to synthesize (and keep stable) and DNA results in a purely DNA result that won’t need to be replaced with DNA later.

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PCR primers are short pieces of single-stranded DNA, usually around 20 nucleotides in length.

You can read more about PCR on Khan Academy or Wikipedia.

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