WEEK 4
CONCEPT OF CULTURING
A pre-requisite to studying microbes is their cultivation under laboratory conditions. Hence, it is important to know the nutrients and physical conditions needed by the organisms.
It is easier to grow bacteria, fungi, and algae in appropriate media. The material on or in which microbes grow in the laboratory is called culture medium. Some media are prepared from complex extracts of plant or animal tissues. A culture is the population of organisms cultivated in a medium.
If a culture contains only one living species of organism regardless of the number of individuals, it is said to be a pure or axenic culture. A culture which contains two or more species growing together is called a mixed culture.
An important medium used for growing microbes is agar. It is a dried polysaccharide extract of red algae which is used as a solidifying agent. It is not broken down by microbes.
EVALUATION
1. What is a culture medium
WAEC CHIEF EXAMINATION REPORT WASSCE MAY/JUNE BIOLOGY PRACTICAL SOLUTIONS AND GUIDES SPECIMENS NAMES A BEAN WEEVIL B BEAN SEED WITH HOLE C WHOLE WATERLEAF PLANT . D QUILL FEATHER . E LONGITUDINAL SECTION OF PINEAPPLE FRUIT F ORANGE FRUIT (Transverse section) G RAW EGG OF A DOMESTIC FOWL . H TEST TUBE CONTAINING 3ML OF WATER J LONGITUDINAL SECTION OF BOILED EGG POSSIBLE QUESTIONS ON SPECIMEN A Zoological Classification: Taxonomic Rank Classification Kingdom Animalia Phylum Arthropoda Class Insecta Sourced 9/05/2025: wikipedia Identify specimen A. Answer: ...
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