SCIENCE! The textbook is getting into the more complicated of its arenas, and I'm getting a crash course in all that stuff I should remember about the building blocks of the living universe. Fortunately, there's a wealth of illustrations of these processes out there, so I had a good time rummaging through them and finding what works well, or horribly, about each.
The trick seems to be expressing the ideas clearly as possible without being misleading about their complexities, which simply can't all be delved into in this book, due to limitations of time and space.
So! This is what I ended up with for the structure of DNA.
Looking at it now, I'm thinking a background color may be in order....but that can wait, for the moment. I did have fun playing with backgrounds a bit while I finished putting the pea pods together.