The essential chemical components of many coenzymes are

1.	Metal ions	2.	Vitamins
3.	Heme	4.	NAD and NADP

Which of the following contain the vitamin niacin?

1. NAD

2. NADP

3. Heme

4. Both A and B

Which of the following cofactor is essential for the proteolytic enzyme carboxypeptidase?

1. Zinc

2. Copper

3. Magnesium

4. Iron

Which of the following organic compound association with the apoenzyme is only transient?

1. Prosthetic group

2. Coenzymes

3. Metal ions

4. Both A and B

The Cofactor present in the Enzyme Peroxidase is

Which of the following is an organic compound?

1. Prosthetic group

2. Coenzymes

3. Metal ions

4. Both A and B

Which of  the following are co-factors?

1. Co-enzymes

2. Metal ions

3. Posthetic groups

4. All of these

The  protein constituent of the enzymes are called

1. Apoenzyme

2. Prosthetic group

3. Co-enzymes

4. Holoenzyme

The non- protein constituent of the enzymes are called

1. Apoenzyme

2. Holoenzyme

3. Cofactors

4. both A and C

Electron transferring enzymes belongs to which class of enzymes

1. Transferases

2. Oxidoreductases

3. Isomerases

4. Lyases