Enzymes . Revision
Quiz by Narimon Aliqulov
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Four test-tubes were set up as shown in the table.In which test-tube would starch be broken down the fastest?29
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Four test-tubes were set up as shown in the table.In which test-tube would starch be broken down the fastest?
The diagram shows an enzyme with its substrate and product molecules.
Q and R
R and S
P and Q
S and P60sEditDelete
An experiment was carried out to investigate the effect of pH on enzyme action. The graph showsthe results. What are the labels for the x-axis and the y-axis?
The graph shows the activity of three digestive enzymes at differing pH levels.Which statement is correct?
Enzymes X and Z are both active at pH4.
Enzymes X and Y are both active at pH7.
Enzymes Y and Z are both active at pH8.
Enzymes Y and Z are both active at pH4.60sEditDelete
The apparatus shown is used for an experiment on starch digestion.Which test-tube contains the most sugar after 20 minutes?
A student wrote some notes about enzymes.She wrote:‘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?
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?
The graph shows how an enzyme-controlled reaction is affected by temperature.Which statement explains the change in activity between X and Y?
There are more effective collisions.
There is more substrate present
The kinetic energy of the molecules has increased.
There is a change in the enzyme shape.60sEditDelete
What is the correct definition of the term enzyme?
carbohydrates that act as substrates
proteins that act as substrates
carbohydrates that act as biological catalysts
proteins that act as biological catalysts60sEditDelete
The diagram shows the effect of an enzyme working in the human digestive system.What would reduce the rate of production of amino acids?
raising the pH to 7.5
raising the temperature to 37.1 °C
removing the amino acids as they are formed
increasing the amount of protein60sEditDelete
The diagrams show molecules involved in the action of a digestive enzyme such as maltase.Which is the substrate?
Enzyme X digests protein in the stomach.Four test-tubes were set up, each contained the same amounts of protein and enzyme X. Thetest-tubes are kept at different levels of pH and temperature, as shown in the table.In which test-tube will protein digestion be quickest?
What is the definition of an enzyme?
a carbohydrate that acts as a catalyst
a DNA molecule that acts as a catalyst
a fat that acts as a catalyst
a protein that acts as a catalyst45sEditDelete
Enzymes function best at their optimum temperature.Which statement describes the effect on an enzyme of increasing the temperature to theenzyme’s optimum temperature?
There are more frequent successful collisions
The enzymes begin to lose their complementary shape
The kinetic energy of the enzymes decreases.
The rate at which enzyme-substrate complexes form is reduced.45sEditDelete
Which statement about enzyme-controlled reactions is correct?
During the reaction, a substrate changes into a product.
The enzyme is slowly broken down during the reaction
The product is gradually used up during the reaction.
The higher the pH the faster the reaction45sEditDelete
Increasing temperature above the optimum for the enzyme results in loss of enzyme activity.How is this explained?
less frequent collisions between the enzyme and the substrate
reduced kinetic energy of the enzyme molecule
substrate molecules move faster and effective collisions are less likely
the shape of the active site is changed and the substrate will no longer fit into it45sEditDelete
Four test-tubes were set up as shown in the diagram.In which test-tube is the starch digested most quickly?
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?
The graph shows the effect of pH on the rate of reaction of an enzyme. What does the graph show?
The rate of reaction halves as the pH changes from pH 5 to pH 7.
The enzyme works best at pH 6.
The enzyme is destroyed at pH 9.
The rate of reaction is the same at pH 5 and pH 8.5.60sEditDelete
The graph shows how enzyme activity is affected by temperature.How can the change in activity between 40 C and 55 C be explained?
The reactants are moving faster
Heat has killed the enzyme.
The substrate is less likely to fit into the active site.
The enzyme has been used up.60sEditDelete
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