Question

What is isoelectric point ? What is zwitterion?

Answer 1

The isoelectric point (pI), sometimes abbreviated to IEP, is the pH at which a particular molecule or surface carries no net electrical charge.
http://en.wikipedia.org/wiki/Isoelectric_Point

Answer 2

ZwitterIon : a molecule or ion having separate positively and negatively charged groups.
http://en.wikipedia.org/wiki/Zwitterion

Answer 3

But next time Post it in Proper Section ( Chemistry ) ^-^

Answer 4

see dis is any amino acid...its has a positive charge on nh3 and negative on coo.
so total electric charge is 0. this is called a zwitter ion.
this zwitter ion is obtained at the isoelectric point.

Answer 5

you got some good explanations do you still need help? If not please close the question :)