Respuesta :
To investigate bacterial metabolism, a researcher divided a population (culture) of Staphylococcus capitis bacteria into two sets of culture tubes containing glucose. The researcher added a chemical to one set of tubes and measured the pH of the cultures at 5 -minute intervals as the bacteria metabolized the glucose into lactic acid. The data are shown in Table 1. Based on the data in Table 1, which of the following is the earliest time point at which there is a statistical difference in average pH between the control and treatment groups?
Statistical difference in average pH and control and treatment groups at the earliest time occured can be known by finding out the difference between the pH ranges of control and test groups at given timings..
what is pH?
pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
At Smin
Control pH= 7.96
Test group pH=7.91
So the difference= 7.96-791=0.05
At10 min
Control pH=7.88
Test group pH=7.85,
Difference=7.88-7.8
At 20 min
Control pH= 7.76
Test group pH=77
Difference= 7.76-7.7= 0.06
At 35 min
Control pH=7.65
Test group pH=7.60
Difference= 7.65-7.64 = 0.05
So the highest difference is 0.06 which is observed at 20 min of time.
So the earliest time point at which statistical difference observed is at 20 min.
Not only the above at 20 min,
pH of test group is 7.7 where control is 7.76 where there is drastic difference from control to test.
7-7 is the pH that is more nearer to neutral pH where 7.76 is nearer to 7.6 that is nearer to basic, So the
change from neutral to basic occured here at 20 min.
Hence, the option b is correct.
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