Question

Logistic growth model describes which type of growth?

(a) Product- based growth

(b) Non-growth

(c) Substrate-based growth

(d) Maintenance-based growth

I had been asked this question in an online interview.

The origin of the question is Kinetics of Cell Substrate Uptake in Cell Culture in division Homogenous Reactions of Bioprocess Engineering

Answer 1

Right option is (c) Substrate-based growth

To explain I would say: Logistic growth model describes the Substrate-based growth. It is used from beginning of exponential phase through end of max population (or stationary phase).

Modification of unlimited growth eqn:

dX/dt = μm X[1 – X/Xf]

Where, Xf = max population size or concentration

Term [1 – X/Xf] describes reduction of specific growth rate as exponential growth phase gives way to retardation phase.