Peptide bond formation

What is the isoelectric point (PI) of glycine? (TUS 2015)

(pKa of the COO group is 2.34 and NH3 group is 9.60)

• 4.92

• 5.97

• 5.17

• 6.18

Which of the following feature of amino acids can be used in protein seperation?

• zwitterion form

• asidic side chain

• pKa value

• isoelectric pH

Why can't proline be detected by the ninhydrin test?

• non-polar aa

• seconder aa

• ring side chain

• polar aa

Which of the following is not a charactheristic of peptide bond?

• non-covalent bond

• double bond

• single bond

• planar bond

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