Which graph shows the effect of temperature on the activity of an enzyme?
5
temperature /°C
enzyme
activity
A B
C
5
temperature/°C
0 100
enzyme
activity
0 100
5
temperature /°C
enzyme
activity
0 100 5
t
...
Which graph shows the effect of temperature on the activity of an enzyme?
5
temperature /°C
enzyme
activity
A B
C
5
temperature/°C
0 100
enzyme
activity
0 100
5
temperature /°C
enzyme
activity
0 100 5
temperature /°C
enzyme
activity
0 100
2 The diagram represents enzyme action.
+
W
+
X Y
What are parts W, X, and Y in this chemical reaction?
enzyme product substrate
A W Y
B X Y
C X W
D Y X
Save My Exams! – The Home of Revision
For more awesome GCSE and A-level resources, visit us at www.savemyexams.co.uk/3 The diagram represents a chemical reaction.
reactants product
+
Which diagram represents the enzyme for this reaction?
A B C
4 The table shows the conditions in four test tubes containing equal amounts of starch and salivary
amylase.
In which test tube is the starch broken down fastest?
pH temperature
/ °C
A 2 27
B 2 37
C 7 27
D 7 37
5 What is true of all enzymes?
they are sugars that are most effective
at pH7
A
B
C
D
Save My Exams! – The Home of Revision
For more awesome GCSE and A-level resources, visit us at www.savemyexams.co.uk/6 The diagram shows the effect of an enzyme working in the human digestive system.
the enzyme at pH 1.5
amino acids
and temperature 37°C
protein
What would reduce the rate of production of amino acids?
A removing the amino acids as they are formed
B increasing the amount of protein
C raising the temperature to 40 °C
D raising the pH to 7.5
7 Which group of compounds ensure that metabolic reactions take place effectively?
A carbohydrates
B enzymes
C fatty acids
D hormones
8 The diagram shows an experiment on the digestion of the protein in egg albumen by protease.
The protease was taken from a human stomach.
In which test tube will the protein be digested most quickly?
A B C D
egg albumen
+
protease
egg albumen
+
dilute
hydrochloric
acid
egg albumen
+
dilute
hydrochloric
acid
+
protease
egg albumen
+
dilute
hydrochloric
acid
+
boiled protease
water-bath
at 37°C
Save My Exams! – The Home of Revision
For more awesome GCSE and A-level resources, visit us at www.savemyexams.co.uk/9 Which effect does a gradual decrease in pH from 13 to 1 have on the action of amylase?
A
B
C
D
slows it down only
slows it down then speeds it up
speeds it up only
speeds it up then slows it down
10 An enzyme in potato cells causes oxygen to be produced from hydrogen peroxide.
Cubes of potatoes were incubated with hydrogen peroxide at different temperatures.
The number of bubbles of oxygen released per minute was counted at each temperature.
The table shows the results.
The results suggest the optimum temperature for the enzyme is between which two values?
A 15°C and 35°C
B 35°C and 45°C
C 35°C and 55°C
D 45°C and 55°C
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