Pennsylvania Keystone Exam - Biology Practice Questions - Pennsylvania Keystone Exam - Biology (PDE STEELS Aligned) Exam

Access More Questions

A student measures the rate of an enzyme-catalyzed reaction across a temperature range from 10°C to 60°C. The reaction rate rises steadily until 37°C, after which it drops sharply to zero by 55°C. What best explains the rapid decline in activity above 37°C?

The substrate molecules are destroyed by excessive thermal energy The enzyme loses its tertiary structure due to denaturation of hydrogen bonds The enzyme converts into a different functional enzyme isoform The activation energy of the reaction increases beyond normal biological limits

Correct Answer:

The enzyme loses its tertiary structure due to denaturation of hydrogen bonds

Access more questions from this quiz

Continue to Pennsylvania Keystone Exam - Biology Practice Questions - Pennsylvania Keystone Exam - Biology (PDE STEELS Aligned) Exam for more practice questions and the full quiz experience.

Access More Questions