What is a colony in microbiology?
Describe features of colonies. See variations in colonial morphology among various species of bacteria. Bacteria grow on solid media as colonies. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike.
How can you tell the difference between two different colonies?
Not only are pigment differences seen, but also size, edge, pattern, opacity, and shine. Two circles have been drawn around merging colonies, where the species of the 2 colonies are different.
How to pick a well-isolated colony?
Two circles have been drawn around merging colonies, where the species of the 2 colonies are different. Trying to pick a bit of one of those adjacent colonies increases the chances of picking up another mixed culture, consisting of the 2 species that were merged together. ALWAYS pick a well-isolated colony when subculturing. WHOLE SHAPE OF COLONY
Why are the features of the colonies important?
Features of the colonies may help to pinpoint the identity of the bacterium. Different species of bacteria can produce very different colonies. In the above picture of a mixed culture, an agar plate that has been exposed to the air and many different colony morphologies can be identified.
How did the colonies from the two treated conditions different shape color quantity etc?
How are the colonies from the two treatment conditions different (e.g., size, color, shape, etc.)? The normal colonies were small, yellow, off white, and red. They were shaped like irregular circles. What effect does the heating and cooling procedure have on the bacteria present in the soil samples?
What are the shape and size of each bacterial colony?
Bacteria. Each distinct circular colony should represent an individual bacterial cell or group that has divided repeatedly. Being kept in one place, the resulting cells have accumulated to form a visible patch. Most bacterial colonies appear white, cream, or yellow in color, and fairly circular in shape.
What are bacterial colonies and how are they formed?
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 are colonies formed?
On a colonized solid surface, such as the various growth media used to culture microorganisms , each colony arises from a single microorganism. The cell that initially adheres to the surface divides to form a daughter cell. Both cells subsequently undergo another round of growth and division.
Why can bacterial colonies be different sizes and shapes?
Simply put, bacteria with different shapes present different physical features to the outside world, and these features help cells cope with and adapt to external conditions.
Why do bacteria have different colors?
Some bacteria have had a gene called "Lac-Z" put into their genomes, so that when they're fed a certain substance, they pull the substance into their cells and cause it to turn blue. Colonies of bacteria that have the gene thus turn blue. Other similar genes can cause bacteria to turn red or other colors.
What does the color of a colony mean?
Color of the colonies (pigmentation) Some bacteria produce pigment when they grow in the medium e.g., green pigment produces by Pseudomonas aeruginosa, buff-colored colonies of Mycobacterium tuberculosis in L.J medium, and red-colored colonies of Serratia marcescens.
How do bacterial colonies differ from molds?
Bacterial colonies are typically smooth while mold colonies are fuzzy. Molds are typically white, gray or green while bacteria come in a variety of colors.
Why is it important to identify different colony shapes edges etc?
Why is it important to be able to identify different colony shapes, sizes, edges, etc.? A way to learn and identify the name of the bacteria. How does streaking a plate result in obtaining a pure culture? What is a selective medium?
What are the colonies?
They were Virginia, Massachusetts, Rhode Island, Connecticut, New Hampshire, New York, New Jersey, Pennsylvania, Delaware, Maryland, North Carolina, South Carolina, and Georgia. By 1750 nearly 2 million Europeans lived in the American colonies. Still others came from Africa.
How would you describe a colony?
0:362:26Bacterial Colony Description - YouTubeYouTubeStart of suggested clipEnd of suggested clipNote that there are two colony types growing on this blood agar plate. The colony morphology of theMoreNote that there are two colony types growing on this blood agar plate. The colony morphology of the smaller colony would be described as white round. And 2 millimeters in diameter.
How would you describe a colony characteristics?
Characteristics of a colony such as shape, edge, elevation, color and texture. When recording colony morphology, it is important to also record color, optical properties (translucence, sheen) and texture (moist, mucoid or dry). However, remember that color is often influenced by environment.
What are the 5 shapes of a colony?
Colony MorphologyShapeMargin (edges)ElevationIrregularUndulate (Wavy)ConvexPunctiform (tiny)RhizoidUmbonateLobateRaisedFilamentousPulvinate (very convex)1 more row
What are 5 characteristics of bacterial colony morphology?
Colonies are described on the basis of size, shape, texture, elevation, pigmentation, and effect on growth medium.
What are the three types of texture of bacteria colonies?
Surface – How does the surface of the colony appear? Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: veined, rough, dull, wrinkled (or shriveled), glistening.
How do you identify a bacterial colony?
0:362:26Bacterial Colony Description - YouTubeYouTubeStart of suggested clipEnd of suggested clipBacteria. Note that there are two colony types growing on this blood agar plate. The colonyMoreBacteria. Note that there are two colony types growing on this blood agar plate. The colony morphology of the smaller colony would be described as white round. And 2 millimeters in diameter.
What is a colony in biology?
Bacteria grow on solid media as colonies. A colony is defined as a visible mass of microorganisms all originating from a single mother cell, therefore a colony constitutes a clone of bacteria all genetically alike.
How many different colonies are there in a mixed culture?
In the above picture of a mixed culture, an agar plate that has been exposed to the air and many different colony morphologies can be identified. Nine obviously different colonies are numbered: some colony types recur in various areas of the plate (note # 3 and # 4). Not only are pigment differences seen, but also size, edge, pattern, opacity, and shine. Two circles have been drawn around merging colonies, where the species of the 2 colonies are different. Trying to pick a bit of one of those adjacent colonies increases the chances of picking up another mixed culture, consisting of the 2 species that were merged together. ALWAYS pick a well-isolated colony when subculturing.
Why is colony morphology important?
Although one might not necessarily see the importance of colonial morphology at first, it really can be important when identifying the bacterium. Features of the colonies may help to pinpoint the identity of the bacterium. Different species of bacteria can produce very different colonies.
Is pigment water soluble?
Some pigments are water-soluble, others are not.