Multiple Choice
If one molecule of glucose undergoes the reaction of glycolysis, what is the net gain of ATP molecules produced?
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8. Respiration
Glycolysis
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Which molecule acts as the primary electron acceptor during glycolysis?
A
NADextsuperscript{+}
B
FAD
C
Oextsubscript{2}
D
ATP
Verified step by step guidance1
Understand the context: Glycolysis is the first step in cellular respiration, where glucose is broken down into two molecules of pyruvate, producing ATP and electron carriers in the process.
Identify the role of electron carriers: During glycolysis, electrons are removed from glucose intermediates and transferred to an electron carrier molecule. This carrier temporarily holds the electrons before passing them to the electron transport chain in later stages of respiration.
Review the options: NAD⁺ (nicotinamide adenine dinucleotide), FAD (flavin adenine dinucleotide), O₂ (oxygen), and ATP (adenosine triphosphate) are the given choices. Consider their roles in cellular respiration.
Focus on NAD⁺: NAD⁺ is the primary electron acceptor during glycolysis. It accepts electrons and becomes reduced to NADH. This process is crucial for capturing energy in the form of high-energy electrons.
Eliminate incorrect options: FAD is used as an electron carrier in the citric acid cycle, not glycolysis. O₂ acts as the final electron acceptor in the electron transport chain, not during glycolysis. ATP is an energy currency molecule, not an electron acceptor.
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