Enzyme Cofactors

An organic substance bound to an enzyme and essential for its activity is called:

1.	coenzyme	2.	holoenzyme
3.	apoenzyme	4.	isoemzyme

Which one of the following is a fat-soluble vitamin and its related deficiency disease?

1.	Ascorbic acid - Scurvy
2.	Retinol - Xerophthalmia
3.	Cobalamine - Beri-Beri
4.	Calciferol - Pellagra

The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins

Which one of the following statements is correct with reference to enzymes?

1. Holoenzyme= Apoenzyme+Coenzyme

2. Coenzyme= Apoenzyme+Holoenzyme

3. Holoenzyme= Coenzyme+ CO-factor

4. Apoenzyme=Holoenzyme+Coenzyme

Consider the following statements:

A:	A coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group
B:	A complete catalytic enzyme with its bound prosthetic group is called apoenzyme

Select the correct option

1. (A) is false but (B) is true

2. Both (A) and (B) are true

3. (A) is true but (B) is false

4. Both (A) and (B) are false

The cofactor of the enzyme carboxypeptidase is:
1. Niacin
2. Flavin
3. Haem
4. Zinc

The protein portion of an enzyme is called:

1.	Apoenzyme	2.	Prosthetic group
3.	Cofactor	4.	Coenzyme

Which one of the following enzymes contains 'Haem' as the prosthetic group?
1. Succinate dehydrogenase
2. Catalase
3. RuBisCo
4. Carbonic anhydrase