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.
Question
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.
Solution
A potential source of error in this experiment could be the "Swab used to collect bacteria." The swab could have already been contaminated with other bacteria before it was used to swab the door handle, which could affect the growth of the E. coli bacteria on the plate. Additionally, the swabbing technique could also vary, leading to inconsistent amounts of bacteria being collected and transferred to the growth plate.
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