1. The problem asks: What are the four nitrogenous bases of RNA? Select all that apply. 2. RNA contains four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U). Thymine (T) is found in DNA, not RNA. Glycogen is not a nitrogenous base; it is a polysaccharide. 3. Therefore, the correct nitrogenous bases of RNA are uracil, guanine, adenine, and cytosine. Final answer: uracil, guanine, adenine, cytosine.