Evaluate these statements about specific co-factors and their roles.
a. Prosthetic groups are distinguished from other cofactors by being tightly bound to the apoenzyme.
b. In the enzyme peroxidase, haem is the prosthetic group.
c. The essential chemical components of many co-enzymes are vitamins.
d. Coenzyme NAD and NADP contain the vitamin niacin.
e. A number of enzymes require metal ions for their activity.
f. Zinc is a co-factor for the proteolytic enzyme carboxypeptidase.
g. Catalytic activity is lost when the co-factor is removed from the enzyme.
