enzymes qp biology Enzymes
1 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 /°
...
enzymes qp biology Enzymes
1 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 they 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.
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 ensures that metabolic reactions take place effectively?
A carbohydrates
B enzymes
C fatty acids
D hormones
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