The interview process was very clear cut. I was invited to a first round interview where they asked simple questions like what my research interests were and to describe my lab and class experience in these areas. They were also very receptive with questions I had about the program in general. However, just note, they are more interested in you showing knowledge of the bigger picture beyond the experiment, the 'why are you doing this experiment' , and 'what is this experiment doing for the project as a whole', than hearing you list a bunch of processes you can do in the lab.