Enzymes are specific proteins that speed up reactions taking - GED Practice Questions
Question
Enzymes are specific proteins that speed up reactions taking place in cells and organisms. Home brewers use enzymes to make beer in a process known as mashing. During this process, milled grain such as barley is mixed with water. This activates an enzyme, bacterial beta-amylase (B-amylase), that is already present in the barley seed or that is formed during the malting process. As shown in the graph below, the brewer has control over the enzyme's activity by varying the temperature of the mash.
Which conclusion is best based on the line graph?
Answers
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Explanation
The correct answer is: When the brewer changes the temperature, the enzyme's activity drops significantly.
The graph clearly shows that as temperature increases, the β-amylase activity decreases more rapidly over time. At 45°C and below, the enzyme activity remains high and stable. However, at higher temperatures (50°C, 57°C, and 66°C), the enzyme activity drops significantly and more quickly. This demonstrates that changing (specifically increasing) the temperature leads to a substantial decrease in enzyme activity.
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