Multiple Choice
What happens to muscle cells if they deplete their supply of oxygen and ATP?
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3. Energy & Cell Processes
Fermentation & Anaerobic Respiration
Multiple Choice
In which of the steps of aerobic and anaerobic cellular respiration does substrate-level phosphorylation occur?
A
In glycolysis only.
B
In the Krebs cycle only.
C
In the electron transport chain only.
D
In both glycolysis and the Krebs cycle.
E
In both the Krebs cycle and the electron transport chain.
Verified step by step guidance1
Understand the concept of substrate-level phosphorylation: It is a type of metabolic reaction that results in the formation of ATP by the direct transfer of a phosphate group to ADP from a reactive intermediate.
Identify the stages of cellular respiration: Cellular respiration includes glycolysis, the Krebs cycle (also known as the citric acid cycle), and the electron transport chain.
Analyze glycolysis: During glycolysis, substrate-level phosphorylation occurs when a phosphate group is directly transferred from a substrate to ADP to form ATP. This happens twice per glucose molecule.
Examine the Krebs cycle: In the Krebs cycle, substrate-level phosphorylation occurs when a phosphate group is transferred to GDP to form GTP, which can then be converted to ATP.
Review the electron transport chain: The electron transport chain primarily involves oxidative phosphorylation, not substrate-level phosphorylation, as ATP is generated through a proton gradient and ATP synthase activity.
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