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Answer: 4. C

Key idea: In a stirred-tank bioreactor the foam breaker is a blade on the shaft near the top, in the headspace above the culture.

In the figure, B is the top of the stirrer shaft (drive), A is a lower impeller that mixes the culture, D is the pipe at the bottom (sparger/inlet) and C is the blade at the top just below the lid. C breaks the foam, so the answer is C.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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