Functionally, _____________ and _____________ are the two most important intracellular components in erythrocytes. One catalyzes the hydroxylation of CO2 and the other exists as a tetramer conjugated to an iron porphyrin ring.
a) carbonic anhydrase; hemoglobin
b) lactate dehydrogenase; calmodulin
c) heme; cholesterol
d) glucose-6-phosphatase; calsequestrin