None are similar. Nothing in undergrad can come close in similarity to the pace and level of detail of medical school. Most of the biology upper divisions have a small amount of content overlap, but you blow away any sort of material you learned in undergrad within a week of the class in medical school. In your BS years, you'll see anatomy, embryology, biochem, physiology, histology, microbiology, all classes you can take as an undergrad, but with different emphasis and a whole different level of intensity.