Question

You decide to investigate if adding more enzyme will cause the reaction to proceed faster. You set out to prove the hypothesis: if more catalase is provided, then the rate of the peroxide reaction will be faster. What would be a good choice for your independent variable?

Answer 1

Answer:

A good choice for the independent variable would be 3,5, and 10 g samples of liver.

Explanation:

The complete question:

You are studying enzymes in biology class. Hydrogen peroxide H₂O₂ is produced as a byproduct of respiration. Hydrogen peroxide is harmful to cells and must be continually broken down. Catalase is an enzyme found in living cells that speeds up the breakdown of hydrogen peroxide into water and oxygen 2 H₂O₂ → 2 H₂O + O₂. You are working with your lab group to investigate what factors influence the rate of the peroxide reaction. Your lab group is provided with liver samples as a source of catalase, as well as 3% hydrogen peroxide. You decide to investigate if adding more enzyme will cause the reaction to proceed faster. you set out to prove the hypothesis: if more catalase is provided, then the rate of the peroxide reaction will be faster. What would be a good choice for your independent variable?

Options for this question are:

• a) 3, 5 and 10 g samples of liver.
• b) measuring the amount of oxygen produced.
• c) 1%, 3%, and 10% concentrations of hydrogen peroxide.
• d) 10 ml, 20 ml, and 30 ml volumes of hydrogen peroxide.

First, it is necessary to differentiate which is the dependent variable and the independent variable.

A dependent variable is one whose variation is being studied, when a hypothesis is elaborated, in this case it would be the catalase reaction, with a fixed amount of 3% H₂O₂ substrate.

An independent variable is one that influences the dependent variable and that can be modified and controlled when performing an experiment, in this case this variable is represented by liver samples, which contains catalase, of different weight.

The hypothesis is "if more catalase is provided, then the rate of the peroxide reaction will be faster" or the rate of a reaction depends upon the amount of enzyme catalase.

According to this, it is logical to think that the liver samples of 3, 5 and 10 grams contain different amounts of catalase, so it is possible to observe faster reactions by increasing the amount of liver added to hydrogen peroxide. Liver samples are the independent variable.

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