Select the true statements about alanine when the pH is equal to its pI. 1) The

ID: 864172 • Letter: S

Question

Select the true statements about alanine when the pH is equal to its pI.

1) The ?-amino group will be predominantly neutral.

2) If an electric field is applied, alanine will not move toward either electrode.

3) The ?-carboxyl group will be predominantly negatively charged.

4) Since alanine does not have an ionizable R group, the zwitterion species will be >50% at any pH.

5) For both the ?-amino group and the ?-carboxyl group, the protonated form is necessary for the formation of the zwitterion.

3) The ?-carboxyl group will be predominantly negatively charged.

4) Since alanine does not have an ionizable R group, the zwitterion species will be >50% at any pH.

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