Chemistry for Biologists

Enzymes

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

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

D
C
A
B
3. Enzymes used to break down proteins in biological washing powders belong to the group:
lactases
proteases
hydrolases
lipases
4. Which of the following is not a commercial advantage of enzyme immobilization:
the thermal stability of the enzyme is increased
the reaction can be carried out at higher temperatures
enzyme easily recovered from reaction mixture
the initial cost of the enzyme is reduced
5. Enzymes speed up biochemical reactions by:
lowering the activation energy of the reaction
increasing the activation energy of the reaction
lowering the temperature of the reaction
increasing the temperature of the reaction
6.
The diagram shows a typical relationship between enzyme activity and:

temperature
substrate concentration
enzyme concentration
pH
7.
The diagram shows a typical relationship between enzyme activity and:

temperature
substrate concentration
pH
enzyme concentration
8. Chemicals (other than the substrate) that affect enzyme activity are called:
mobilizers
immobilizers
inhibitors
exhibitors
9. Enzymes belong to which group of chemicals:
lipids
polysaccharides
saccharides
proteins
10. Enzymes act as biological:
substrates
solvents
catalysts
inhibitors

 

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