Is the DNA in a cell also...?

The nucleolus? Because on my diagram which I am using for my cell model project, the ball inside the Nucleus is labeled as the DNA. I'm also wondering if, for my project it'd be okay for my nucleus to be a ball in a concave center, and then cut off a fourth of it so I can put the nucleolus or DNA or whichever it is inside it? Or does the nucleus have to be as big as the concave center?