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Question 1 of 20
1. Question1 point(s)
The diagram shows the effect of an enzyme working in the human digestive system.
What would reduce the rate of production of amino acids?CorrectIncorrect
Question 2 of 20
2. Question1 point(s)
What controls the speed of chemical reactions in all living cells?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
The graph shows the effect of temperature on an enzyme-controlled reaction.
Which statement describes the effect of temperature on this reaction?CorrectIncorrect
Question 4 of 20
4. Question1 point(s)
The graph shows the effect of pH on the activity of a human digestive enzyme.
What is the enzyme?CorrectIncorrect
Question 5 of 20
5. Question1 point(s)
The diagram shows a protease molecule catalysing the break down of a protein molecule.
What are the parts labelled P, Q, R and S?
enzyme product substrate active site A P Q R S B R S P Q C S P Q R D S R Q PCorrectIncorrect
Question 6 of 20
6. Question1 point(s)
Which statement about enzymes is correct?CorrectIncorrect
Question 7 of 20
7. Question1 point(s)
Which enzyme is used to produce clear apple juice?CorrectIncorrect
Question 8 of 20
8. Question1 point(s)
Where in the alimentary canal is the enzyme trypsin found and what are the products of the reaction it catalyses?
products A duodenum amino acids B duodenum fatty acids C ileum proteins D stomach amino acidsCorrectIncorrect
Question 9 of 20
9. Question1 point(s)
Why does excessive heat decrease enzyme activity?CorrectIncorrect
Question 10 of 20
10. Question1 point(s)
Four test-tubes were set up as shown in the table.
In which test-tube would starch be broken down the fastest?
2 cm3 starch
1 cm3 of
1 cm3 of boiled
A ✓ ✓ x 5 B ✓ ✓ x 35 C ✓ x ✓ 5 D ✓ x ✓ 35
✓ = present
x = absentCorrectIncorrect
Question 11 of 20
11. Question1 point(s)
The diagram shows an enzyme with its substrate and product molecules.
Which form an enzyme-substrate complex?CorrectIncorrect
Question 12 of 20
12. Question1 point(s)
Which substrate, enzyme and product are correctly named?
substrate enzyme product A amino acids trypsin protein B amylase maltose glucose C lipase lipid fatty acids and glycerol D maltose maltase glucoseCorrectIncorrect
Question 13 of 20
13. Question1 point(s)
The apparatus shown is used for an experiment on starch digestion.
Which test-tube contains the most sugar after 20 minutes?CorrectIncorrect
Question 14 of 20
14. Question1 point(s)
A student wrote some notes about enzymes.
‘The ……1…… of the enzyme is ……2…… to an area on the substrate.
This area on the substrate can fit into it to form an ……3…… complex’.
Which words correctly complete gaps 1, 2 and 3?
1 2 3 A active site complementary enzyme-substrate B active site similar enzyme-product C shape complementary enzyme-product D shape similar enzyme-substrateCorrectIncorrect
Question 15 of 20
15. Question1 point(s)
The graph shows the effect of temperature on the action of an enzyme.
Why does the rate of reaction change when the temperature is increased from 20 °C to 30 °C?
energy of particles
collisions of particles
A ✓ ✓ B x ✓ C ✓ x D x xCorrectIncorrect
Question 16 of 20
16. Question1 point(s)
Which row shows an enzyme with the correct site of production and products?
A amylase salivary glands amino acids B amylase stomach sugar C protease salivary glands sugar D protease stomach amino acidsCorrectIncorrect
Question 17 of 20
17. Question1 point(s)
The graph shows how an enzyme-controlled reaction is affected by temperature.
Which statement explains the change in activity between X and Y?CorrectIncorrect
Question 18 of 20
18. Question1 point(s)
What is the correct definition of the term enzyme?CorrectIncorrect
Question 19 of 20
19. Question1 point(s)
Enzyme X digests protein in the stomach.
Four test-tubes were set up, each contained the same amounts of protein and enzyme X. The test-tubes are kept at different levels of pH and temperature, as shown in the table.
In which test-tube will protein digestion be quickest?
pH temperature / °C A 2 20 B 2 35 C 7 20 D 7 35CorrectIncorrect
Question 20 of 20
20. Question1 point(s)
The activity of lipase is measured in four parts of the gut.
Which part has the most lipase activity?CorrectIncorrect