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
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 thermal stability of the enzyme is increased
the initial cost of the enzyme is reduced
enzyme easily recovered from reaction mixture
5. Enzymes act as biological:
solvents
inhibitors
substrates
catalysts
6. 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
7.
The diagram shows a typical relationship between enzyme activity and:

substrate concentration
temperature
pH
enzyme concentration
8.
The diagram shows a typical relationship between enzyme activity and:

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

 

RSC