An alpha helix is a:
1. primary structure of a protein
2. secondary structure of a protein
3. tertiary structure of a protein
4. quaternary structure of a protein
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The inhibition of succinic dehydrogenase by malonate is an example of:
1. Non-competitive reversible inhibition
2. Non-competitive irreversible inhibition
3. Competitive inhibition
4. Allosteric inhibition
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The enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds are called as:
1. | Oxidoreductases | 2. | Hydrolases |
3. | Ligases | 4. | Lyases |
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Consider the following enzymes:
I. Catalase
II. Peroxidase
III. Carboxypeptidase
Which of these enzymes require haem as a co-factor for their activity?
1. | I only | 2. | I and II only |
3. | II and III only | 4. | I, II and III |
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Chitin, a complex polysaccharide, is found in:
1. | Plant cell wall |
2. | The exoskeleton of arthropods and cell walls of most fungi |
3. | Bacterial cell wall |
4. | Cartilage and other connective tissues |
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Given below is the structure of a monosaccharide. The homopolymer of this monosaccharide is used in:
|
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Given below is the structure of a lipid. The excess of this compound in human blood can lead to:
1. | Alzheimer’s disease | 2. | Phenylketonuria |
3. | Atherosclerosis | 4. | Rheumatoid arthritis |
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Shown below is a level of structural organization of a protein. Which of the following proteins attains its final form as this structure?
1. Keratin | 2. Fibroin |
3. Tropo-collagen | 4. Myoglobin |
Assuming they all had the same number of carbon atoms, which of the following has the most C-H bonds?
1. an unsaturated fat
2. a polyunsaturated fat
3. a polysaccharide
4. a saturated fat
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Consider the following two statements regarding enzyme action:
I: | Co-factors play a crucial role in the catalytic activity of the enzyme. |
II: | Catalytic activity is reduced when the co-factor is removed from the enzyme. |
Of the above statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
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