Biology 9700 · AS & A Level · Factors that affect enzyme action

Factors that affect enzyme action — practice question

Yeast contains the enzyme catalase, which speeds up the decomposition of hydrogen peroxide ($\text{H}_2\text{O}_2$) as follows. $2\text{H}_2\text{O}_2 \xrightarrow{\text{catalase}} 2\text{H}_2\text{O} + \text{O}_2$ Yeast was introduced into a hydrogen peroxide solution, and the total volume of oxygen given off was measured every $30$ seconds over $2$ minutes. Every other variable was kept constant. The results are shown in the table. What explains the pattern in the data?

  • AThe rate of reaction increases as more enzyme-substrate complexes are formed.
  • BThe rate of reaction increases as the enzyme reaches its maximum velocity ($V_{\text{max}}$).
  • CThe volume of oxygen released decreases as the enzymes begin to denature.
  • DThe volume of oxygen released decreases as more substrate is converted into product.

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