aww what a charming composition! I'm a sucker for poems that are educational in a way, and find some way (with stretches here and there) to incorporate topics as objective as sciences. Then again, I do get the U and I entendre, but I would've thought uracil as a base. Still, it's an idea I've also had, only never executed, and this is seamless for what it's worth.
Suggestions, if you wish to expand or brand this concept are making the L - O - V - E stand for something and to make the most of a metaphor; for example, the core / basis / beginning of it all or set of instructions [on how to love]
Another thought is to play around repeating a stanza; in particular the last one, which could work wonderfully as a chorus.
On to the harsher side, the rhyming is not always complemented by the rhythm, which creates awkward phrasings or pronunciations, see second verses of both the first stanzas. Something else is how the nucleosome-chromosome "rhyme" loses some points for having the same etymological root, though again, one is only so limited talking about desiderata a DNA coded you to feel.
Second to last stanza feels odd; I would suggest some brackets in between to fill in with words to make the sentence cohesive without compromising the rhythm flow and yeah, lovely poem!