A change in an amino acid located distantly from the active site of an enzyme can affect the specificity of the enzyme towards its substrate by:
1. | making the enzyme unstable |
2. | cause a relocation of the enzyme within a cell |
3. | changing the shape of the protein |
4. | changing the optimum pH and temperature values for the enzyme |
An amino acid that is negative charged amongst the following will be:
1. Glutamic acid | 2. Lysine |
3. Arginine | 4. Histidine |
The metal ion that acts as a co-factor for both alcohol dehydrogenase and carbonic anhydrase is:
1. | Magnesium | 2. | Iron |
3. | Zinc | 4. | Nickel |
The living state can be best described as a:
1. non equilibrium steady state
2. non equilibrium non steady state
3. equilibrium non steady state
4. equilibrium steady state
The blood concentration of glucose in a normal healthy individual is:
1. 3.5 – 4.0 mM | 2. 4.0 – 4.5 mM |
3. 4.2 – 6.1 mM | 4. 5.0 – 5.5 mM |
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
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
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
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
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 |