Q. No.The number of ends in a glycogen molecule
1. Equal to the number of branches plus one
2. Equal to the number of branch points
3. One
4. Two, one on the left side and another on the right side
1. Equal to the number of branches plus one
2. Equal to the number of branch points
3. One
4. Two, one on the left side and another on the right side
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Enzymes are biocatalysts. They catalyse biochemical reactions. In general they reduce activation energy of reactions. Many physic-chemical processes are enzyme mediated. Some examples of enzyme mediated reactions are given below. Tick the wrong entry
1. Dissolving CO2 in water
2. Untwining the two strands of DNA
3. Hydrolysis of sucrose
4. Formation of peptide bond
Which of the following is the best evidence for the 'Lock-and-key model' of enzyme action?
1. all isolated enzymes have been identified as proteins
2. compounds similar in structure to the substrate inhibit the reaction
3. enzymes are found in living organisms and speed up certain reactions
4. enzymes determine the direction of reaction
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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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An enzyme brings about :
1. Decrease in reaction time
2. Increase in reaction time
3. Increase in activation energy
4. Reduction in activation energy
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The high energy bonds in an ATP molecule are between :
1. Ribose and nitrogenous base
2. Nitrogenous base and phosphate
3. Ribose and phosphate
4. Phosphate groups
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