Multiple Choice
In glycolysis, what is the initial substrate (starting molecule) that enters the pathway in most cells?
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Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway
Glycolysis 1
Multiple Choice
Glycolysis begins with which 6-carbon molecule?
A
Glyceraldehyde 3-phosphate
B
Fructose 1,6-bisphosphate
C
Pyruvate
D
Glucose
Verified step by step guidance1
Understand that glycolysis is the metabolic pathway that breaks down glucose to extract energy for cellular metabolism.
Recall that glycolysis starts with a 6-carbon sugar molecule, which is the substrate for the pathway.
Identify the molecule options given: Glyceraldehyde 3-phosphate (3 carbons), Fructose 1,6-bisphosphate (6 carbons but is an intermediate), Pyruvate (3 carbons, end product).
Recognize that the initial molecule entering glycolysis is glucose, a 6-carbon sugar, before it is converted into intermediates like fructose 1,6-bisphosphate.
Conclude that glycolysis begins with glucose, the 6-carbon molecule that is phosphorylated and processed through the pathway.
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