On the titration curve for an amino acid.In terms of the letters on the graph,label the isoelectric point,the pKa of the amino group and the pKa of the carboxyl group. 
Definitions:
Confidence Interval
A variety of values taken from sample data, expected to encompass the value of a not yet known population attribute.
Standard Error
A common measure of variability within a sample's distribution, particularly focused on the mean.
Confidence Interval
A range of values, derived from a set of sample data, that is likely to contain the value of an unknown population parameter.
Mean
The arithmetic average of a set of numbers, calculated by adding all the numbers together and dividing by the count of the numbers.
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