What is the purpose of re streaking?
As you might guess, the purpose of streaking for isolation is to produce isolated colonies of an organism on an agar plate. This is useful when you need to separate organisms in a mixed culture or when you need to study the colony morphology of an organism.
Why do you use a new sterile loop in each new zone in the streak plate technique?
Always use sterile equipment to spread the inoculum. Flame the loop or use a new disposable loop after you streak each quadrant. Using a new or sterilized loop allows you to effectively dilute the inoculum on the plate and obtain isolated colonies by spreading the inoculum thinner and more evenly.
What is the purpose of growing the transformed bacteria on a plate containing antibiotics such as ampicillin?
The purpose of this technique is to introduce a foreign plasmid into bacteria, the bacteria then amplifies the plasmid, making large quantities of it. A plasmid is a small circular piece of DNA (about 2,000 to 10,000 base pairs) that contains important genetic information for the growth of bacteria.
What is the purpose of using the streak plate method quizlet?
What is the purpose of streak plating? To obtain isolated, pure colonies. Bacteria is transferred to the edge of an agar plate with an inoculating loop and then treated out over the surface in one of several patterns.
What is the advantage of using the streak plate method over the pour plate method?
What advantage does the streak plate method have over the pour-plate method? The streak plate method does not require any additional media for dilution and only requires one plate for inoculation.
What does the streak technique enable us to achieve?
In microbiology, streaking is a technique used to isolate a pure strain from a single species of microorganism, often bacteria. Samples can then be taken from the resulting colonies and a microbiological culture can be grown on a new plate so that the organism can be identified, studied, or tested.
What streaking means?
1 : to move swiftly : rush a jet streaking across the sky. 2 : to have a streak (as of winning or outstanding performances) 3 : to run naked through a public place.
Why did you flame the loop when streaking between the quadrants?
This is done by having the loop pick up only a small amount of bacteria from the previous quadrant’s streaks. Flaming the loop between streaks ensures that the loop starts clean and that only this small amount of bacteria is used to inoculate the next quadrant.
Why correct sterilization and cooling of the inoculation loop is important during streaking?
Why should the inoculating loop be cooled? In this way all contaminants on the wire are incinerated. Never lay the loop down once it is sterilised, or it may again become contaminated. Allow the loop to cool a few seconds before contacting the inoculum to avoid killing the microorganisms.
What would happen if you forgot to sterilize your loop in between each quadrant streak?
What is a bacterial colony? What would happen if you forgot to sterilize your loop in between each quadrant streak? … You would spread a lot of bacteria back into quadrant one and probably not see isolated colonies.