Question

Choose the statements that are correct with respect to continuous culture systems:
(A) In a simple stirred tank bioreactor, stirring happens through sparging of air bubbles
(B) A bioreactor has an agitator system, oxygen delivery system, and foam control system
(C) Sampling ports provide vents to withdraw small volumes of culture periodically
(D) Culturing in bioreactors is classified as downstream processing
Choose the correct answer from the options given below:

• A. (A), (B) and (C) only
• B. (A), (C) and (D) only
• C. (B) and (C) only
• D. (A) and (D) only

Answer 1

Answer: (A)

(A), (B) and (C) only

Answer 2

Statements (A), (B), and (C) are correct. In simple stirred tank bioreactors, air sparging aids stirring; bioreactors have agitators, oxygen delivery, and foam control systems; sampling ports enable periodic culture withdrawals. Statement (D) is incorrect, as downstream processing involves product purification, while bioreactor culturing is upstream.