#Question id: 148
#Unit 1. Molecules and their Interaction Relevant to 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
#Unit 1. Molecules and their Interaction Relevant to 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
#Unit 1. Molecules and their Interaction Relevant to 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
#Unit 1. Molecules and their Interaction Relevant to 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?
#Question id: 152
#Unit 1. Molecules and their Interaction Relevant to Biology
According to the Henderson-Hasselbalch equation, when the concentrations of proton acceptor and proton donor are the same, then
#Question id: 153
#Unit 1. Molecules and their Interaction Relevant to Biology
For the amino acid lysine, the Henderson-Hasselbalch equation can be applied to ________ ionization group(s)