JMU Bio 140 Lab Checkpoint Quiz 5-12 | 60 Questions with 100% Correct Answers | Verified | Latest Update 2024

Why is it important to post-rinse when pipetting volumes less than 20 microliters? A. Small volumes may not get expelled completely due to surface tension. B. You can't accurately pipette less than 20 microliters. C. You don't need to post rinse small volumes. D. Small volumes will evaporate prior to transfer. - A. Pipettors are most accurate in the middle to top end of their volume range. True False - True How can contamination be prevented in the laboratory? A. Keeping test tubes and pipette tip boxes closed as much as possible. B. Changing pipette tips between solutions, or after tips have touched DNA. C. Using barrier pipette tips. D. Any of these methods will help prevent contamination in the laboratory. - D. When filling a pipette you should begin by depressing the plunger to the ______________ in ____________________. - first stop, the air