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Stirred tank bioreactors have been designed for:

1. addition of preservatives to the product
2. purification of the product
3. ensuring anaerobic conditions in the culture vessel
4. availability of oxygen throughout the process

Correct answer: availability of oxygen throughout the process

Solution

Stirred tank bioreactors use agitation to mix the culture and enhance oxygen transfer from the gas phase into the liquid. This helps keep oxygen available to microorganisms or cells throughout the process.

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