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Which of the following is not a defined media?

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in Bioprocess Engineering by (80.7k points)
Which of the following is not a defined media?

(a) Glucose

(b) Magnesium chloride

(c) Calcium chloride

(d) Phenyl acetic acid

I have been asked this question during an internship interview.

My doubt stems from Cell Nutrients topic in division An Overview of Biological Basics & Enzymes of Bioprocess Engineering

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Right choice is (d) Phenyl acetic acid

To explain: Defined media contain specific amounts of pure chemical compounds with known chemical compositions. A medium containing glucose, (NH4)2SO4, KH2PO4, and MgCl2 is a defined medium. Complex media contain natural compounds whose chemical composition is not exactly known. Complex medium used in penicillin fermentation includes Phenyl acetic acid by continuous feed in a concentration of about 0.5-0.8% of total (g/liter).

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