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

1. coenzyme                   

2. holoenzyme

3. apoenzyme                 

4. isoenzyme

Subtopic:  Enzyme Cofactors |
 76%
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The enzyme amylase belongs to the class

1. hydrolase                       

2. isomerase

3. transferase                     

4. lyases

Subtopic:  Enzymes Classification |
 65%
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Cobalt is present in the molecule of

1. vitamin B6

2. vitamin B12

3. vitamin B2

4. vitamin B1

 77%
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DNA has deoxyribose as the constituent sugar. The position where the sugar lacks oxygen is

1. 1

2. 2

3. 3

4. 4

Subtopic:  Carbohydrates: Introduction | Carbohydrates: Glycosidic Bond & Disaccharide |
 73%
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The linkage that joins two adjacent nucleotides in RNA is

1. phosphate ester                 

2. phosphodiester

3. phosphate anhydride         

4. N-glycoside

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 86%
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Phosphodiester bond is present in

1. ATP

2. ADP

3. cAMP

4. none of these

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
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Heating may cause denaturation of enzyme or protein mainly by damaging its

1. physical configuration

2. chemical structure

3. both physical configuration as well as chemical structure

4. other properties.

Subtopic:  Structural Organisation of Proteins |
 75%
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Which of the following is incorrect?

1. The hair protein, keratin, is synthesized from the amino acid methionine

2. Phospholipids act as carriers of small non polar molecules across the cell membrane

3. Dietary intake of PUFA decreases the serum cholesterol level in our body

4. Cobalt is a constituent of Vit B12

Subtopic:  Structural Organisation of Proteins |
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Which of the following vitamins is a coenzyme for amino acid and fatty acid metabolism?

1. Vitamin B6               

2. Vitamin B12

3. Vitamin B1               

4. Vitamin B2

Subtopic:  Enzyme Cofactors |
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The inhibition of succinic dehydrogenase by malonate is an example of

1. competitive inhibition

2. non-competitive inhibition

3. allosteric modulation

4. none of the above

Subtopic:  Enzyme Inhibition: Introduction | Enzyme Inhibition |
 92%
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