Question

question 9
1 pts
during a class experiment, wendy investigates the rates of catalyzed reactions at different temperatures. which statement is a valid hypothesis for her experiment?
enzymes act upon too many different molecules to run this test; the data would be inconclusive.
each enzyme has an optimal temperature at which it catalyzes a reaction.
enzymes catalyze all reactions at the same rate, no matter the environmental conditions.
enzymes always catalyze reactions at the same rate and are not affected by temperature.

Explanation:

A valid hypothesis for an experiment on enzyme - catalyzed reaction rates at different temperatures should relate temperature to enzyme - catalyzed reaction rate. Enzymes have an optimal temperature for activity. The first option is about the complexity of enzyme - substrate interactions, not about temperature. The third and fourth options are incorrect as enzyme - catalyzed reaction rates are affected by environmental conditions like temperature.

Answer:

Each enzyme has an optimal temperature at which it catalyzes a reaction.