▼ Is DNA molecule bigger than one water molecule? Yes.

 Is one DNA molecule or compound bigger than one carbon dioxide molecule? 

Its an entire chemical structure represent One Genetic Code. Its not just a symbol U, or C, or A, or G.

Is studying chemistry will help to study DNA?

Structure, are using the same ideas behind, its called the chemical structure, their bonding interact with a different force to connect the complementary base. How between "atoms" those things are very real, exactly the same like the chemistry studies taught you.

I guess I don't understand a thing, so I don't care really how they are related to chemistry or biology.

I see. Its normal. But if you try to ask others, you better just make sure, that chemist, you just ask them a chemistry question. A biologist, you ask marine life those question. When you deal with biochemistry, you ask reaction in the body question. And you only ask the DNA to molecular biologists, whom have really worked in lab. A lot of people may not necessarily just like me, repeats words to tell you things.

If it is you to ask?

What?