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The diagram shows the effect of an enzyme working in the human digestive system.
A, B, C
D
The diagram shows the effect of an enzyme working in the human digestive system.
Which group of compounds ensures that metabolic reactions take place effectively?
A carbohydrates
B enzymes
C fatty acids
D hormones
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?
Which effect does a gradual decrease in pH from 13 to 1 have on the action of amylase?
A. slows it down only
B. slows it down then speeds it up
C. speeds it up only
D. speeds it up then slows it down
An enzyme in potato cells causes oxygen to be produced from hydrogen peroxide. Cubes of potato were incubated with hydrogen peroxide at different temperatures. The numbers of bubbles of oxygen released per minute were counted at each temperature. The table shows the results.
Which graph shows the effect of temperature between 20 °C and 35 °C on the activity of a human digestive enzyme?
Lactase is a human enzyme that catalyses the breakdown of lactose in milk. At which temperature does lactase work fastest?
A 0 °C
B 18 °C
C 37 °C
D 100 °C
The graph shows the effect of pH on a particular enzyme-controlled reaction.
What happens to most enzymes above 60 °C?
A They are denatured.
B They are destroyed by white blood cells.
C They are digested.
D They are made more active.
An experiment was carried out to investigate the effect of pH on enzyme action. The graph shows the results.
