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Why is only increasing vessel size not enough in scale-up?

Answer and explanation

Correct answer: Because mixing and oxygen transfer also change

The governing concept is bioprocess scale-up: a larger vessel does not behave like a small vessel simply because its geometric volume has increased. Changes in dimensions alter agitation, circulation paths, mixing time, heat removal, gas dispersion, and the transfer of oxygen from bubbles into the culture. If oxygen transfer becomes slower than cellular demand, dissolved oxygen may fall and growth or product formation can decline. Therefore, scale-up must preserve suitable engineering conditions, not merely volume. Option A is correct because it identifies mixing and oxygen transfer as key variables. Options B, C, and D are scientifically unrelated or false: product does not automatically disappear, cells do not become metal, and nutrients remain important.

Related tags

Scale-UpMixingOxygen TransferBioprocess EngineeringPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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