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Microbiology Lab Midterm Barbosa Exam Questions And Improved Responses parfocal - answersonly a little fine adjustment is needed to bring a specimen into focus when switching from low to high power iris diaphragm - answersused to vary the illumination of the object being viewed rheostat - answerschanges the intensity of the light beam aseptic technique - answersprevent the contamination of the culture and spreading of microorganisms into the environment How can bacterial culture m...