Final answer:
The first electron acceptor during glycolysis in cellular respiration is NAD+.
Step-by-step explanation:
An electron acceptor is a chemical entity or molecule that accepts electrons during a redox (oxidation-reduction) reaction. In biological systems, electron acceptors play a crucial role in various metabolic processes, including cellular respiration and photosynthesis.
In cellular respiration, which occurs in both eukaryotic and prokaryotic cells, electrons are transferred through a series of protein complexes in the electron transport chain (ETC). These electrons eventually reach a final electron acceptor, leading to the production of energy in the form of adenosine triphosphate (ATP).
In cellular respiration, the first electron acceptor during glycolysis is NAD+ (nicotinamide adenine dinucleotide).