How do you classify bacterial colonies?
Colony morphology is a method that scientists use to describe the characteristics of an individual colony of bacteria growing on agar in a Petri dish. It can be used to help to identify them. A swab from a bin spread directly onto nutrient agar. Colonies differ in their shape, size, colour and texture.
What 2 features of a bacterial colony can be used to identify the type of bacteria?
Colony morphology can sometimes be useful in bacterial identification. Colonies are described on the basis of size, shape, texture, elevation, pigmentation, and effect on growth medium.
What types of bacteria grow on nutrient agar?
Result Interpretation on Nutrient agar
| S.N | Organism | Growth |
|---|---|---|
| 1. | Escherichia coli | Good-luxuriant |
| 2. | Salmonella Typhi | Good-luxuriant |
| 3. | Staphylococcus aureus | Good-luxuriant |
| 4. | Streptococcus pyogenes | Good-luxuriant |
What are bacterial colonies?
Bacterial Colony Definition and Overview A bacterial colony is what you call a group of bacteria derived from the same mother cell. This means that a single mother cell reproduces to make a group of genetically identical cells, and this group of cells form a mass, which is known as a bacterial colony.
How do you count bacterial colonies on agar?
The primary trick in counting colonies is to count each colony dot once. One approach is to set the Petri dish on a grid background and count the colonies in each grid cell, moving in a methodical pattern through all of the cells. Marking counted colonies on the back of the Petri dish can also be a helpful approach.
What is a bacterial colony?
A bacterial colony is what you call a group of bacteria derived from the same mother cell. This means that a single mother cell reproduces to make a group of genetically identical cells, and this group of cells form a mass, which is known as a bacterial colony.
How does bacteria grow on agar plates?
Agar, which is a polysaccharide derived from red seaweed (Rhodophyceae) is preferred because it is an inert, non-nutritive substance. The agar provides a solid growth surface for the bacteria, upon which bacteria reproduce until the distinctive lumps of cells that we call colonies form.