Chemistry for Biologists

Enzymes

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

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

B
C
D
A
3. Enzymes used to break down proteins in biological washing powders belong to the group:
lactases
hydrolases
lipases
proteases
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.
The diagram shows a typical relationship between enzyme activity and:

temperature
substrate concentration
enzyme concentration
pH
6. Chemicals (other than the substrate) that affect enzyme activity are called:
exhibitors
mobilizers
immobilizers
inhibitors
7. 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
8.
The diagram shows a typical relationship between enzyme activity and:

enzyme concentration
substrate concentration
temperature
pH
9. Enzymes belong to which group of chemicals:
lipids
polysaccharides
proteins
saccharides
10. Enzymes act as biological:
catalysts
inhibitors
substrates
solvents

 

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