Multiple Choice
In which of the steps of aerobic and anaerobic cellular respiration does substrate-level phosphorylation occur?
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3. Energy & Cell Processes
Fermentation & Anaerobic Respiration
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In glycolysis in the absence of oxygen, cells need a way to regenerate which compound?
A
Ethanol
B
Carbon dioxide
C
Lactate
D
Glucose
E
NAD+
Verified step by step guidance1
Understand the process of glycolysis: Glycolysis is the metabolic pathway that converts glucose into pyruvate, releasing energy and producing ATP and NADH in the process.
Recognize the role of NAD+ in glycolysis: During glycolysis, NAD+ is reduced to NADH as it accepts electrons. This is crucial for the continuation of glycolysis as NAD+ is needed to accept electrons again.
Identify the problem in anaerobic conditions: In the absence of oxygen, the electron transport chain cannot function, and NADH cannot be oxidized back to NAD+ through oxidative phosphorylation.
Explore alternative pathways: Cells use fermentation to regenerate NAD+. In lactic acid fermentation, pyruvate is reduced to lactate, regenerating NAD+ from NADH, allowing glycolysis to continue.
Conclude the importance of NAD+ regeneration: The regeneration of NAD+ is essential for glycolysis to proceed in anaerobic conditions, ensuring that ATP production can continue even without oxygen.
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