Melmichigan,
For graduate work in the sciences, here are the requires from what it was a few years ago when I was looking into several career options:
Social Sciences--usually only statistics, maybe Calc AB at top schools
Physics--usually through multivariable calculus or differential equations, less for geology/meteorology/marine science...
Chemistry--usually through Calc BC
Biology--usually through Calc AB or biological sciences calculus
Engineering--usually through differential equations
Medical School--about half require Calc AB or another math class (counting statistics), top ones (Johns Hopkins, Harvard...) through Calc BC
MD/PhD Programs--usually Calc AB, some through Calc BC (unless the PhD is in epidemiology, math, or engineering, but only a few schools offer that option)
Most careers in the sciences don't require a lot of advanced math unless someone chooses to specialize in data modelling or theoretical science. It can be helpful, though. In my MD/PhD program right now, I'm finding that knowing a lot of advanced math helps in creating new models of biomedical and population-based medicine and in thinking about abstract problems in my field.
