There are a number of issues with this question that you'll need to know before you can continue.
1. How do you convert between nanometers and angstroms?
2. What is the relationship between nucleic acids and amino acids?
3. What is the volume of a cylinder, in general?
4. What is Schrödinger's estimate?
Once you've answered these questions, I think you can write out the formula giving you the answer.