Q. No.If the concentration of enzymes 1 and 2 are increased but the concentration of enzyme 3 is decreased, the rate of formation of D will:
1. Decreases
2. Increases
3. Remains same
4. First increase and then decrease
2. Increases
3. Remains same
4. First increase and then decrease
Consider the given two statements:
| I. | The rate determining step for an enzyme-substrate reaction is always the second step in which [ES] is converted into the product. |
| II. | Once the enzyme performs its duty, it is free to do more work. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
In the given diagram showing two helices A and B:
| 1. | A is left handed helix and B is right handed helix |
| 2. | A is right handed helix and B is left handed helix |
| 3. | Both are right handed helices |
| 4. | Both are left handed helices |
An enzyme catalyzed reaction has a △G of -30 Kcal/mol. The amount of enzyme is doubled. What will be the △G for the new reaction?
1. -60 kcal/mol
2. -30 kcal/mol
3. +30 kcal/mol
4. +60 kcal/mol
Identify the incorrect statement regarding Michaelis-Menten kinetic analyses of enzyme action:
| 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. |
If you compare the Km values for the enzymes that remove glucose from the blood in liver and brain, you expect that:
| 1. | the value will be higher for the enzyme found in brain |
| 2. | the value will be exactly ten times lower for the enzyme found in liver |
| 3. | the values for two enzymes will be same |
| 4. | the value will be lower for the enzyme found in brain |
Which of the following pairs of amino acids is only ketogenic and not glucogenic?
1. Leucine and Lysine
2. Tyrosine and Tryptophan
3. Glutamic acid and Aspartic acid
4. Alanine and Arginine
Which of the following diagrams represents the ‘micelle’ formation by amphiphilic molecules in a non polar organic solvent?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
According to the International Union of Biochemistry and Molecular Biology, the enzymes belonging to EC 1 are:
| 1. | Oxidoreductases: catalyze oxidation/reduction reactions |
| 2. | Transferases: transfer a functional group (e.g. a methyl or phosphate group) |
| 3. | Hydrolases: catalyze the hydrolysis of various bonds |
| 4. | Lyases: cleave various bonds by means other than hydrolysis and oxidation |
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Maltose is a disaccharide with two glucose molecules taking part in its formation. The molecular formula of maltose will be:
| 1. | C6H10O5 | 2. | C3H6O3 |
| 3. | C12H24O12 | 4. | C12H22O11 |
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