Which device is used to suction liquids into or expel liquids out of pipettes?

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Multiple Choice

Which device is used to suction liquids into or expel liquids out of pipettes?

Explanation:
Creating a controlled suction to move liquids with a pipette is done with a pipette-aid. This device is designed to generate negative pressure so you can draw liquid into the pipette tip and then push or release it to expel the liquid. It provides a safe, precise way to transfer volumes, and it also helps avoid mouth pipetting. In contrast, a microcentrifuge spins samples, a Petri dish is used for growth or culture, and a peg rack is simply a holder—none of these create or control suction for pipetting.

Creating a controlled suction to move liquids with a pipette is done with a pipette-aid. This device is designed to generate negative pressure so you can draw liquid into the pipette tip and then push or release it to expel the liquid. It provides a safe, precise way to transfer volumes, and it also helps avoid mouth pipetting. In contrast, a microcentrifuge spins samples, a Petri dish is used for growth or culture, and a peg rack is simply a holder—none of these create or control suction for pipetting.

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