What is the enzyme responsible for converting free carbon dioxide in the blood into forms in which ...

What is the enzyme responsible for converting free carbon dioxide in the blood into forms in which it can be transported in the blood?
 
  a. carbonic anhydrase
  b. carboxypeptidase
  c. carbonase
  d. decarboxylase
  e. dehydrogenase

Question 2

The injectable pain-killing drug called Prialt is an improvement over morphine-type drugs because it:
 
  a. can easily be extracted from cone snails
  b. is less expensive to produce than morphine
  c. also removes the memory of pain from the affected person
  d. is not addictive
  e. is from invertebrates