Chemistry for Biologists

Enzymes

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

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

D
B
C
A
3. Enzymes used to break down proteins in biological washing powders belong to the group:
lactases
lipases
proteases
hydrolases
4. Which of the following is not a commercial advantage of enzyme immobilization:
the reaction can be carried out at higher temperatures
the initial cost of the enzyme is reduced
the thermal stability of the enzyme is increased
enzyme easily recovered from reaction mixture
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:
immobilizers
mobilizers
exhibitors
inhibitors
7.
The diagram shows a typical relationship between enzyme activity and:

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

 

RSC