DNA is made up of 4 main components (G,C,A and T). Very generally these encode instructions for making proteins.

Those blocks are very small, less than 20 Atoms.

https://en.m.wikipedia.org/wiki/Adenine

They’re working on using it for storage. (very slow read write times). Duplicating shouldn’t be a problem.

https://en.m.wikipedia.org/wiki/DNA_digital_data_storage

Each electron present in one of the atom's orbitals is a bit, so yeah.

More realistically, the simplest atom- one proton, one electron- has 3 integer numbers associated with the state of the electron. You need more than a bit to describe the state of that system, so yeah.