Question

what is the purpose of using a disposable tip on the micropipette?

○ a. the disposable tip prevents the formation of air bubbles, which can interfere with your measurements.

○ b. the disposable tip contains the volume markings and so without it measurements would be inaccurate.

○ c. the plunger of the micropipette cannot be pushed down unless a disposable tip is attached.

○ d. the disposable tip ensures that no liquid gets into the shaft of the micropipette.

Explanation:

Disposable tips on micropipettes are used to prevent liquid from entering the micropipette's shaft. This protects the internal mechanism of the pipette from contamination and damage. Option a is incorrect as the tip itself doesn't prevent air bubbles (proper technique does). Option b is wrong because volume markings are on the pipette body, not the tip. Option c is false as the plunger can be pushed without a tip (though not when aspirating liquid).

Answer:

d. The disposable tip ensures that no liquid gets into the shaft of the micropipette.