Centrifuge tubes are designed to withstand high speeds and forces generated during centrifugation, which is not the case with regular test tubes. Centrifuge tubes typically have a conical shape with a wider bottom and a tapered top, while regular test tubes usually have a cylindrical shape with straight sides. This shape allows for the efficient separation of samples based on density during centrifugation, which is not possible with regular test tubes. The tapered shape of centrifuge tubes also makes it easier to recover the separated material without disturbing the other components in the tube.
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