Multiple Choice
What is the main difference between aerobic and anaerobic replenishment of energy in cells?
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8. Respiration
Review of Aerobic Cellular Respiration
Multiple Choice
Molecular oxygen (\(O_2\)) has what role in aerobic cellular respiration?
A
It acts as the final electron acceptor in the electron transport chain.
B
It is used to break down glucose during glycolysis.
C
It donates electrons to NADH during the Krebs cycle.
D
It is converted directly into ATP during oxidative phosphorylation.
Verified step by step guidance1
Understand the process of aerobic cellular respiration, which includes glycolysis, the Krebs cycle, and oxidative phosphorylation. Molecular oxygen (\(O_2\)) plays a critical role in the final stage, oxidative phosphorylation.
Learn about the electron transport chain (ETC), where electrons are transferred through a series of protein complexes embedded in the inner mitochondrial membrane. This process generates a proton gradient used to produce ATP.
Recognize that molecular oxygen (\(O_2\)) acts as the final electron acceptor in the electron transport chain. It combines with electrons and protons to form water (\(H_2O\)), ensuring the continuation of the ETC.
Clarify that \(O_2\) is not directly involved in glycolysis, as glycolysis occurs in the cytoplasm and does not require oxygen. It is also not converted directly into ATP during oxidative phosphorylation; instead, ATP is synthesized by ATP synthase using the proton gradient.
Understand that \(O_2\) does not donate electrons to NADH during the Krebs cycle. NADH is produced during the Krebs cycle and donates electrons to the electron transport chain, where \(O_2\) accepts them at the end.
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