O 4/11/2017 06:00 AM A 18/20 4/5/2017 10:35 PM Gradebook Print Calculator Period
ID: 507523 • Letter: O
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O 4/11/2017 06:00 AM A 18/20 4/5/2017 10:35 PM Gradebook Print Calculator Periodic Table Question 10 of 11 ncorrect Incorrect Map Ca Sapling Learning this question has been customized by Kenn Harding at Texas A&M; University macmillan learning Which of the following statements about the operation of an automated micropipettor are true? Select all that apply. The point of initial resistance is the level of depression that will fill the pipette with the desired volume of solution. A new disposable plastic tip is required for each sample. Do not eject the plastic pipette tip. The plunger should be depressed all the way until the button meets the top of the pipette in order to fill the tip with the desired volume of solution. Incorrect. One of your answers is incorrect Previous Try Again Next ExitExplanation / Answer
Taking the first set of questions,
Option (iii) is incorrect.
This can be explained as follows:
i) Correct: The point of initial resistanceis the level of depression that will fill the pipette with the desired volume as the first thing that we do while using the pipette is to push the air out by pushing the plunger in, which creates vaccuum inside the pipette that can later be filled by the required liquid.
ii) Correct: A disposable plastic tip is required for each sample because while taking the sample it is absolutely necessary to make sure we take the exact amount and not mix the solutions. If we use the same tip, we might risk mixing the two solution we take one after the other.
iii) Incorrect: We need to eject the pipette tip every time we take a fixed amout of solution. Ejecting the tip helps in taking the exact amount of volume that we need.
iv) Correct: Yes, the plunger should be depressed all the way down to the tip of the pipette because this makes sure that all the air present in the pipette is pushed out and vaccuum is created so that the pipette can be filled with the required solution in the necessary amount.
In second set of questions, option (iii) is incorrect.
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