Read the following statements regarding stirred-tank bioreactors: (A) A stirred-tank reactor is usually cylindrical or with a curved base to facilitate the mixing of the reactor contents. (B) The stirrer facilitates even mixing and oxygen availability throughout the bioreactor. (C) A bioreactor has an agitator system and an oxygen delivery system, but lacks a pH control system. (D) Small volumes of the culture cannot

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Statement (A) is correct as the curved base of a stirred-tank reactor facilitates the mixing of the reactor contents. Statement (B) is correct because the stirrer facilitates even mixing and oxygen availability throughout the bioreactor. Statement (C) is incorrect because a bioreactor has an agitator system, an oxygen delivery system, a foam control system, a temperature control system, and a pH control system. Statement (D) is incorrect because bioreactors are equipped with sampling ports so that small volumes of