In that careers in biology and chemistry require advanced degrees (yes, I'm ignoring computer science due to its general absence from LACs), here are the top ten schools (alphabetically) producing the highest percentages of future PhDs in those two fields:
Biology - Caltech, Earlham, Grinnell, Kalamazoo, MIT, Mudd, Princeton, Reed, Swarthmore, UChicago
Chemistry - Bowdoin, Caltech, Carleton, Franklin & Marshall, Grinnell, Mudd, NM Inst. Mining & Tech, Reed, Wabash, Wooster
Of those, Bowdoin, Carleton, F&M, Earlham, Grinnell, Kalamazoo, Reed, Swarthmore, Wabash and Wooster are LACs, and Mudd is LAC-like, but has few non-tech graduates.
Source:
REED COLLEGE PHD PRODUCTIVITY