Chemistry for Biologists

Enzymes

1.
In the diagram, which letter represents the ‘active site-directed inhibitor present’ curve:

C
D
A
B
2.
In the diagram, which letter represents the ‘non-active site-directed inhibitor present’ curve:

D
C
B
A
3. Which of the following is not a commercial advantage of enzyme immobilization:
the initial cost of the enzyme is reduced
the thermal stability of the enzyme is increased
the reaction can be carried out at higher temperatures
enzyme easily recovered from reaction mixture
4. Enzymes used to break down proteins in biological washing powders belong to the group:
proteases
lactases
hydrolases
lipases
5.
The diagram shows a typical relationship between enzyme activity and:

temperature
enzyme concentration
substrate concentration
pH
6. Chemicals (other than the substrate) that affect enzyme activity are called:
inhibitors
exhibitors
mobilizers
immobilizers
7.
The diagram shows a typical relationship between enzyme activity and:

temperature
substrate concentration
enzyme concentration
pH
8. Enzymes speed up biochemical reactions by:
increasing the activation energy of the reaction
lowering the activation energy of the reaction
increasing the temperature of the reaction
lowering the temperature of the reaction
9. Enzymes act as biological:
substrates
solvents
catalysts
inhibitors
10. Enzymes belong to which group of chemicals:
lipids
proteins
polysaccharides
saccharides

 

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