All of the Following Are Characteristic of the Tense Form

Multiple Choice

All of the following are characteristic of the tense form of hemoglobin EXCEPT

A) Some N-terminal amino and histidine groups have lowered pKs.
B) the subunit structure is stabilized by ionic bonds.
C) the molecule can bind bis-phosphoglycerate (BPG) .
D) the molecule has a reduced affinity for oxygen.
E) the molecule has an increased affinity for carbon dioxide.