Primary metabolite=substances produced by an organism as part of its normal growth. They include amino acis, proteins, enzymes, nucleic acids, ethanol and lactate. The production of primary metabolites matches the growthh in population of the organism.
Secondary metabolites=substances produced by an organism that are not of its normal growth. THe antibiotic chemicals produced by a number of microorganisms are almost all secondary metabolites. The production of secondary metabolites usuallly begins after the main growth period of the organisms and so does not match the growth in population of the organism.
It is important to remember that whilst all mircroorganisms produce primary metabolites, they need in order to grow, only a relatively small number of microorganisms produce secondary metabolites.
All organisms use this growth curve not just microorganisms. If they can grow and reproduce. They will also be subkect to similar constraints.
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