Why would the following medium not be considered a chemically defined medium:
Glucose, 5 grams (g); NH4Cl, 1g; KH2PO4, 1g; MgSO4, 0.3g; yeast extract, 5g; distilled water, 1 litre
I am unsure why it is not a chemically-defined medium considering all measurements and grams are given and such is required for it to be one. Therefore I am unsure why it would not be a chemically defined medium.