#Question id: 146
#Section 2: General Biology
The pH inside cells is normally near pH 7. At pH 7 which statement is true about the charges (ionization state) of the α-Carboxyl and α-Amino groups of an amino acid?
#Question id: 147
#Section 2: General Biology
Which structure below is appropriate for glycine at neutral pH?
#Question id: 148
#Section 2: General Biology
The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.
#Question id: 149
#Section 2: General Biology
The pKaʹs of the side chain group and the α-carboxyl group of glutamate are 4.1 and 2.1, respectively. Which statement accounts for this difference?
#Question id: 150
#Section 2: General Biology
How do the pKa values of an ionizable side chain compare when the amino acid is free versus when it is in a polypeptide chain?
#Question id: 151
#Section 2: General Biology
The isoelectric point of alanine is pH = 6.15. It is mixed with proline (pHCOOH = 2.0; pHNH2= 10.6), and the mixture is placed in an electric field at pH 6.15. Which statement is true?