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Factors that Affect the Rate of Enzyme Reactions

60 questions found

Practice Questions

A decrease in pH far below the optimum value causes reduced enzyme activity because

A. The substrate completely disappears

B. Ionic and hydrogen bonds maintaining enzyme structure become disrupted ✓

C. The activation energy becomes negative

D. Product concentration becomes zero

Extreme pH alters the ionization of amino acid side chains and disrupts the interactions maintaining the enzyme's tertiary structure.

In enzyme kinetics, the reaction reaches a maximum rate when

A. Every enzyme molecule has an occupied active site ✓

B. Product concentration becomes zero

C. Temperature reaches freezing point

D. The enzyme becomes denatured

At substrate saturation, all available active sites are occupied, so adding more substrate cannot further increase the reaction rate.

During laboratory investigation of enzyme activity, maintaining constant temperature is essential because

A. Temperature directly influences molecular collisions and enzyme structure ✓

B. Temperature changes substrate identity

C. Temperature changes enzyme concentration

D. Temperature eliminates activation energy

Temperature affects both reaction kinetics and enzyme stability. Even small deviations from the optimum can alter experimental results.

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