Final answer:
A complex defined medium is a type of culture medium that contains extracts and digests of yeasts, meat, or plants, but whose precise chemical composition is not known. Nutrient broth, tryptic soy broth, and brain heart infusion are examples of complex media. The type of bacteria that grow in a complex medium is diverse and includes both fastidious and non-fastidious organisms.
Step-by-step explanation:
In microbiology, a complex defined medium is a type of culture medium that contains extracts and digests of yeasts, meat, or plants, but whose precise chemical composition is not known. It is a mixture with many components and the amounts of individual components are undetermined and variable. Nutrient broth, tryptic soy broth, and brain heart infusion are examples of complex media.
The type of bacteria that grows in a complex medium is diverse and includes both fastidious organisms, which cannot make certain nutrients and require them to be added to the medium, and non-fastidious organisms. Complex media provide a rich and varied nutrient source that allows for the growth of a wide range of bacteria.