If only one molecule of pyruvate (instead of two) were produced per glucose molecule metabolized in glycolysis, then which of the following would be produced after glycolysis and before the electron transport chain? 
Definitions:
Ground Substance
The unstructured material that fills the space between the cells and contains the fibers in connective tissue.
Connective Tissue
Tissue that supports, binds together, and protects organs in the body, consisting of various cell types within an extracellular matrix.
Heparin
A medication and naturally occurring substance that prevents blood from clotting, commonly used in medical settings.
Histamine
A compound found in the body that acts as a neurotransmitter and is involved in local immune responses, as well as regulating physiological functions in the gut and acting as a mediator of itching and allergic reactions.
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