Q. No.The plot represents the relationship between
substrate concentration and velocity for a
single enzyme in the absence (curve x) and
presence (curve y) of a compound that binds
allosterically to the enzyme. The allosteric
compound is:
1. a competitive inhibitor.
2. a noncompetitive inhibitor.
3. an irreversible inhibitor.
4. an activator.
substrate concentration and velocity for a
single enzyme in the absence (curve x) and
presence (curve y) of a compound that binds
allosterically to the enzyme. The allosteric
compound is:
2. a noncompetitive inhibitor.
3. an irreversible inhibitor.
4. an activator.
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 |
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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
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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 |
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All the following assumptions apply to Michaelis-Menten kinetic analyses of enzyme action EXCEPT:
1. the total enzyme concentration studied at each substrate concentration is fixed in analysis of enzyme kinetics.
2. formation of enzyme-substrate complex does not appreciably decrease the concentration of substrate.
3. Km decreases with competitive inhibition.
4. maximal velocity is reached when the enzyme-substrate complex is equal to the total concentration of enzyme present.
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The conversion of glucose into lactic acid in
our muscles takes place in:
1. 9 metabolic steps
2. 10 metabolic steps
3. 11 metabolic steps
4. 12 metabolic steps
The living state is synonymous with:
1. Cellular organization
2. Metabolism
3. Consciousness
4. Reproduction
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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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Enzymes, vitamins and hormones are common in :
1. Being proteinaceous
2. Being synthesized in the body of organisms
3. Enhancing oxidative metabolism
4. Regulating metabolism
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