Question
Lactose can be removed from milk by passing the milk through a column of alginate beads to which immobilized lactase is bound. What is an advantage of immobilizing the enzyme?
A. It creates more active sites.
B. The alginate beads act as a coenzyme.
C. It lowers the activation energy of the reaction.
D. It allows the product to be separated easily from the enzyme.
▶️Answer/Explanation
Markscheme
D
Question
What is the advantage of using lactase in an immobilized state in the food manufacturing industry?
A. It functions within cells.
B. It dissolves in multiple solvents.
C. It converts cellulose into glucose.
D. It is less likely to become denatured.
▶️Answer/Explanation
Markscheme
D
Question
What effect do changes in pH have on enzymes?
A. All enzymes increase in activity as pH increases.
B. The activity of all enzymes is reduced by a pH below or above 7.
C. Low pH causes reversible denaturation in all enzymes.
D. Extreme pH can alter the active site of all enzymes.
▶️Answer/Explanation
Markscheme
D
Question
What is a common feature of enzymes?
A. They all react with substrates.
B. They all decrease the rate of reaction.
C. They are all secreted from cells in vesicles.
D. They all bind to the active site of their substrate.
▶️Answer/Explanation
A
Question
The graph shows the activity of an enzyme at different temperatures.
What does the dashed line in the graph represent?
A. Increasing temperature increases substrate concentration.
B. Increasing temperature affects the active site.
C. Increasing temperature increases the rate of reaction.
D. Increasing temperature decreases the movement of particles.
▶️Answer/Explanation
B
Question
In which processes are macromolecules broken down into monomers?
A. Anabolism and catabolism
B. Catabolism and hydrolysis
C. Hydrolysis and reduction
D. Reduction and anabolism
▶️Answer/Explanation
B
Question
Which process is an example of catabolism?
A. Translation of mRNA
B. Replication of DNA
C. Hydrolysis of protein
D. Synthesis of a disaccharide
▶️Answer/Explanation
C
Question
The graph shows the activity of an enzyme at various temperatures. The pH of the experiment was kept constant at pH 8.
Based on the data, what would the result be if the experiment was repeated at pH 9?
A. The enzyme activity would be higher.
B. The results of the enzyme activity would be almost the same.
C. The enzyme activity would be lower.
D. There is not enough information to make a reliable prediction.
▶️Answer/Explanation
D
Question
The graph shows the results of an investigation into the activity of turnip peroxidase. The accumulation of the product of the reaction catalysed by the enzyme is shown at different pH values.
Based on the data in the graph, what is most probably the optimum pH for turnip peroxidase?
A. Between 3 and 5
B. Between 10 and 11
C. Between 7 and 8
D. Between 9 and 10
▶️Answer/Explanation
C