Science Enhanced S&S Biology - Virginia Department …

14. With pipette, withdraw 1 mL of the water from test tube. 15. With Petrifilm™ plate on flat surface, carefully peel open top film layer, being careful not to touch either the film layer or yellow-hatched gel layer. 16. With pipette perpendicular to Petrifilm™ plate, dispense the 1 … ................
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