Answer:
A pure culture consists of only one type of microbe while a mixed culture has two or more than two microbes.
Step-by-step explanation:
A pure culture consists of only one type of microbe. 
While a mixed culture consists of more than one type of microbes. such cultures may comprise of different species of bacteria or a group of bacteria, viruses and other pathogens. 
In mixed culture the microbe species living together may harm each other existence.