Multiple Choice
Suppose you are planning experiments to measure oxygen consumption in cells. Which of the following methods would be most appropriate for directly quantifying the rate of cellular respiration?
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8. Respiration
Introduction to Cellular Respiration
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Which of the following is the correct balanced chemical equation for cellular respiration?
A
$\mathrm{C_6H_{12}O_6} + 6\,\mathrm{H_2O} \rightarrow 6\,\mathrm{CO_2} + 6\,\mathrm{O_2}$
B
$\mathrm{C_6H_{12}O_6} + 6\,\mathrm{O_2} \rightarrow 6\,\mathrm{CO_2} + 6\,\mathrm{H_2O} + \text{energy}$
C
$6\,\mathrm{CO_2} + 6\,\mathrm{H_2O} \rightarrow \mathrm{C_6H_{12}O_6} + 6\,\mathrm{O_2}$
D
$\mathrm{C_6H_{12}O_6} + 6\,\mathrm{CO_2} \rightarrow 6\,\mathrm{O_2} + 6\,\mathrm{H_2O}$
Verified step by step guidance1
Step 1: Understand the process of cellular respiration. Cellular respiration is a metabolic process where glucose ($\mathrm{C_6H_{12}O_6}$) is broken down in the presence of oxygen ($\mathrm{O_2}$) to produce carbon dioxide ($\mathrm{CO_2}$), water ($\mathrm{H_2O}$), and energy in the form of ATP.
Step 2: Recall the general chemical equation for cellular respiration. The correct equation is: $\mathrm{C_6H_{12}O_6} + 6\,\mathrm{O_2} \rightarrow 6\,\mathrm{CO_2} + 6\,\mathrm{H_2O} + \text{energy}$. This equation shows that one molecule of glucose reacts with six molecules of oxygen to produce six molecules of carbon dioxide, six molecules of water, and energy.
Step 3: Analyze the given options. Compare each option to the general equation for cellular respiration. Look for the correct reactants (glucose and oxygen) and products (carbon dioxide, water, and energy).
Step 4: Eliminate incorrect options. For example, the first option incorrectly lists water ($\mathrm{H_2O}$) as a reactant instead of oxygen. The third option represents photosynthesis, not cellular respiration, as it shows the production of glucose and oxygen. The fourth option incorrectly lists carbon dioxide as a reactant.
Step 5: Identify the correct option. The second option matches the general equation for cellular respiration: $\mathrm{C_6H_{12}O_6} + 6\,\mathrm{O_2} \rightarrow 6\,\mathrm{CO_2} + 6\,\mathrm{H_2O} + \text{energy}$. This is the balanced chemical equation for cellular respiration.
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