Multiple Choice
The oxygen consumed during cellular respiration is directly involved in which process?
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8. Respiration
Introduction to Cellular Respiration
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Which of the following best describes the first stage of cellular respiration?
A
It requires oxygen to proceed.
B
It produces a net gain of 2 ATP molecules per glucose molecule.
C
It occurs in the cytoplasm and breaks down glucose into two molecules of pyruvate.
D
It is called glycolysis.
Verified step by step guidance1
Understand that the first stage of cellular respiration is glycolysis, which is a process that occurs in the cytoplasm of the cell.
Recognize that glycolysis involves the breakdown of one glucose molecule (C₆H₁₂O₆) into two molecules of pyruvate (C₃H₄O₃).
Note that glycolysis does not require oxygen to proceed, making it an anaerobic process.
During glycolysis, a small amount of energy is captured in the form of ATP. Specifically, there is a net gain of 2 ATP molecules per glucose molecule processed.
Additionally, glycolysis produces 2 molecules of NADH, which are used later in cellular respiration to generate more ATP in the presence of oxygen.
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