0
Yellowish
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
When performing a streak plate culture in what direction should one rotate the nutrient plate?
Counter-clockwise
What is a bacterial colony?
Isolated colonies of bacteria are the result of a single bacterium which has replicated many times and eventually formed a visable lump of genetically identical bacteria. The colony's shape, texture and colour can somtimes be helpful in identifying the species of bacteria. For example collonies of Serratia marrceccens are typically pink, moist looking, round and small on nutrient agar. I laymans terms isolated colonies are the single separated spots (normally semi-spherical like zits) on the plate after it has been incubated. If the bacteria are put on the plate too close together they will form a lawn which looks like the whole plate is covered evenly.
How does incubation temperature affect the colony morphology of Serratia marcescens?
These gram negative rods produce mucoid colonies which have entire margins and umbonate elevation. There are both red and white colonies present on a plate. Some strains of S. marcescensproduce the red pigment prodigiosin in response to incubation at 30o C, but do not do so at 37o C. This is an example of temperature-regulated phenotypic expression.
How would you record your observation of a plate containing 305 colonies?
colony counter
When you rub a pumice rock on a streak plate what color is left on the streak plate?
The streak test is really only useful in mineral identification, not for combinations of them as with pumice.
What color are the colonies of E Coli when growing on a nutrient agar plate?
whitw to whitish gray
When performing a streak plate in which direction should one rotate the nutrient plate?
anti clock wise
When performing a streak plate culture in what direction should one rotate the nutrient plate?
Counter-clockwise
What is a bacterial colony?
Isolated colonies of bacteria are the result of a single bacterium which has replicated many times and eventually formed a visable lump of genetically identical bacteria. The colony's shape, texture and colour can somtimes be helpful in identifying the species of bacteria. For example collonies of Serratia marrceccens are typically pink, moist looking, round and small on nutrient agar. I laymans terms isolated colonies are the single separated spots (normally semi-spherical like zits) on the plate after it has been incubated. If the bacteria are put on the plate too close together they will form a lawn which looks like the whole plate is covered evenly.
What is a colony in microbiology?
A colony is a group of identical bacteria (clones) which grow together into a visible cluster. Generally, a colony is grown on an nutrient agar plate (on a petri dish with bacteria food in it) such that it is large enough to see the bacteria. An additional type of colony is a "microcolony" which is a term used for a group of the same bacteria which grown in the dirt.
How would you determine whether a colony was a contaminant on a streak plate?
One to determine whether a colony on a streak plate is a contaminant is by observing whether it is located along the streak lines. Another is to compare the size, shape, texture and color of the colony against an uncontaminated sample to see if it matches previous ones. Anything growing beyond streak lines and outside of the expected pattern of growth is an obvious contaminant.
How does incubation temperature affect the colony morphology of Serratia marcescens?
These gram negative rods produce mucoid colonies which have entire margins and umbonate elevation. There are both red and white colonies present on a plate. Some strains of S. marcescensproduce the red pigment prodigiosin in response to incubation at 30o C, but do not do so at 37o C. This is an example of temperature-regulated phenotypic expression.
Can you change the color of your license plate?
No. The licence plate cannot be altered.
Will s aureus grow on a crystal violet agar plate?
Yes. S. aureus can grow on TSA plate because this plate is general purpose medium and has most nutrient for bacteria growth.
What is the method called when the bacteria sample and nutrient agar are mixed before pouring?
Pour plate method
What color is tin plate?
gray
How would you record your observation of a plate containing 305 colonies?
colony counter
