Question

Which of the following Fed-batch system is described as a fixed volume?

(a) The same medium used to establish the batch culture

(b) A solution of the limiting substrate

(c) A concentrated solution of the limiting substrate

(d) A very concentrated solution of the limiting substrate

This question was posed to me in quiz.

My doubt is from Fed Batch Culture topic in chapter Microbial Growth Kinetics of Bioprocess Engineering

Answer 1

Right answer is (d) A very concentrated solution of the limiting substrate

To explain I would say: A very concentrated solution of the limiting substrate added at a rate less than the same medium used to establish the batch culture, a solution of the limiting substrate and a concentrated solution of the limiting substrate, resulting in an insignificant increase in volume.