Cell and Molecular Biology
Most of the cell biology questions will be based on Campbell's, though questions often test biotechnology procedures in depth. These are extensively covered in Albert's Molecular Biology of the Cell, specifically in chapters 8 and 9. For some practice with higher level molecular biology problems, take a look at our practice set here: here.
Chromatography - This website goes over several types of chromatography, all of which are important to USABO, and have shown up in past exams. Be sure to understand the principles behind each of these chromatography techniques.