A laboratory worker prepares a streak plate of a bacterial culture. While there is substantial growth on the plate, there is very poor separation of isolated colonies. All of the following are possible reasons for the poor separation except: Group of answer choices Streaking with the side of a loop Failure to flame the loop between streaks Insufficient inoculum on the loop Re-crossing over the first set of streaks

Select ALL of the following statements that are INCORRECT with regards to the streaking technique: Group of answer choices The final set of streaks must always finish by touching the first set of streaks. The objective of streaking out a bacterial sample is to increase the bacterial numbers on the surface of the agar plate so that a loan of bacteria is formed. In order to dilute the bacteria, each set of streaks must begin within the previous set. The purpose of flaming the loop between each set of streaks is to reduce the bacterial numbers transferred to the subsequent set of streaks.

Which of the following can lead to contamination when streaking an agar plate? Group of answer choices All of the other responses are equally possible Flaming the loop immediately after picking off a colony Forgetting to flame the loop before picking off a colony Re-crossing the first set of streaks Streaking with the side of a loop Forgetting to flame the loop between streaks

Imagine that you forgot to flame the loop before streaking the inoculum from the first quadrant into the second quadrant. What is the most likely consequence of this error?Too much bacterial growth outside the first quadrant.Contamination of the broth culture.Too little bacterial growth outside the first quadrant.Contamination of the Petri plate culture.

A sterile agar plate, I, is streaked with a pure culture of bacteria by means of aseptic techniques. Paper discs treated with the antibiotics Aureomycin (A) and penicillin (P) are placed at opposite sides of the plate, as shown in the diagram above. The plate is examined after a 24-hour incubation period, and a clear ring is discovered around disc A, but not around disc P. Within the clear ring around disc A, a single bacterial colony with physical characteristics like those of the pure culture is observed. A second sterile agar plate, II, is then streaked with this single colony and also incubated with antibiotics.

Students conducted a study on how quickly a bacterial species, E. coli, can grow when they are grown on a special plate. They swabbed a door handle using a clean swab, placed the bacteria on to the plate, and let the plate grow in different locations for ten days. The data for the experiment is shown below:Day Number of Colonies112222883328284440405523236612127744Which of the following might be a source of error in this experiment?Elimination ToolSelect one answerAAmount of time.BGrowth plate.CSwab used to collect bacteria.DLocation used to collect bacteria.