I am taking cell this semester and it was an enormous help to really learn the concepts...but then again I do not have a lot of other biology classes taken (only AP bio, bio I/II, anat and phys, and micro) so it may be too basic for you. I guess this depends on what level the cell is at your school. My brother took a 400 level cell the semester he took the mcat and he got an 11 in bio, for what it's worth. He credited that class to his score.
Sorry for the quick hijack, but I have a similar question for genetics. I actually do need it and would love to take it but I am not sure if it will help for the MCAT. I only have so many hours in the day so that 8 hours a week in class/lab plus however many hours to study seems like it would be better spent for MCAT review, esp for areas in the PS section.
I am good w/punnet squares, gene linkages (like figuring out the order), sex linked genes (how they're acquired plus common ones), and I will read up on restriction enzymes. Would genetics still be helpful?