Multiple Choice
How is cellular respiration best described?
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8. Respiration
Introduction to Cellular Respiration
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Which of the following is an output of the aerobic respiration of glucose in cells?
A
Glucose ($\mathrm{C_6H_{12}O_6}$)
B
NADH
C
Oxygen ($\mathrm{O_2}$)
D
Carbon dioxide ($\mathrm{CO_2}$)
Verified step by step guidance1
Understand the process of aerobic respiration: Aerobic respiration is a metabolic pathway where glucose ($\mathrm{C_6H_{12}O_6}$) is broken down in the presence of oxygen ($\mathrm{O_2}$) to produce energy in the form of ATP, along with byproducts such as carbon dioxide ($\mathrm{CO_2}$) and water ($\mathrm{H_2O}$).
Identify the inputs and outputs of aerobic respiration: The main inputs are glucose ($\mathrm{C_6H_{12}O_6}$) and oxygen ($\mathrm{O_2}$), while the outputs include ATP, carbon dioxide ($\mathrm{CO_2}$), and water ($\mathrm{H_2O}$).
Recognize the role of carbon dioxide ($\mathrm{CO_2}$): During aerobic respiration, carbon dioxide ($\mathrm{CO_2}$) is produced as a waste product during the breakdown of glucose in the citric acid cycle (Krebs cycle).
Eliminate incorrect options: Glucose ($\mathrm{C_6H_{12}O_6}$) is an input, not an output. NADH is an intermediate electron carrier, not a final output. Oxygen ($\mathrm{O_2}$) is also an input, not an output.
Conclude that carbon dioxide ($\mathrm{CO_2}$) is the correct answer: It is a byproduct released during aerobic respiration and is expelled from the cell as waste.
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