Equivalents

... probably because you've used molecular weight of base pair 3) yeah, by that you get the number of molecules. No reason to make that since both are equivalents. But I would guess it's because of the last sentence "10^13 ssDNA strands per liter and that's a lot"

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During active photosynthesis (non-photoinhibitory conditions), mitochondria in a leaf cell are able to oxidise surplus redox equivalents arising from photosynthetic electron transport. Those redox equivalents are then exported from chloroplasts via the malate–OAA shuttle or the DHAP–PGA ...

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... building the DNA. It is also the main energy currency of the cell, you can find it everywhere. other NTPs are used for DNA as well. And they are equivalents of ATP, so they can be used sometimes instead of it. Like GTP is often used by GTPases or in Kreb's cycle. NAD and FAD are electron carriers ...

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So what are the arsenic equivalents of ATP and DNA/RNA?

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also, our genome has size of ~3 Gbp, that is, you use ~3giga ATP-equivalents only in the body of DNA (not mentioning the process of building), so have more DNA would be quite energetically demanding

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