When the co-factor is removed from the enzyme, its catalytic activity:

1. remains same

2. is increased

3. is greatly reduced

4. is lost

For its activity, carboxypeptidase requires 

(1) Copper

(2) Zinc

(3) Iron

(4) Niacin

Prosthetic groups differ from co-enzymes in that
1. they require metal ions for their activity.
2. they (prosthetic groups) are tightly bound to apoenzymes.
3. their association with apoenzymes is transient.
4. they can serve as co-factors in a number of enzyme-catalyzed reactions.

Apoenzyme is:

Which of the following is an inorganic compound?

1. Prosthetic group

2. Coenzymes

3. Metal ions

4. Apoenzymes