Chemistry for Biologists

Enzymes

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

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

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

enzyme concentration
substrate concentration
temperature
pH
6. Chemicals (other than the substrate) that affect enzyme activity are called:
mobilizers
immobilizers
inhibitors
exhibitors
7. Enzymes act as biological:
substrates
solvents
inhibitors
catalysts
8. Enzymes speed up biochemical reactions by:
increasing the activation energy of the reaction
increasing the temperature of the reaction
lowering the activation energy of the reaction
lowering the temperature of the reaction
9.
The diagram shows a typical relationship between enzyme activity and:

enzyme concentration
substrate concentration
temperature
pH
10. Enzymes belong to which group of chemicals:
polysaccharides
lipids
saccharides
proteins

 

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