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Multiple Choice
In glycolysis, which molecule derived from dietary carbohydrates is the primary reactant that enters the pathway?
A
Glycogen
B
Pyruvate
C
Lactate
D
Glucose
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Verified step by step guidance
1
Understand that glycolysis is the metabolic pathway that breaks down carbohydrates to produce energy in the form of ATP.
Identify the primary molecule derived from dietary carbohydrates that enters glycolysis. Dietary carbohydrates are first broken down into simpler sugars during digestion.
Recognize that glycogen is a storage form of glucose in animals, not the initial molecule entering glycolysis directly from diet.
Know that pyruvate and lactate are products or intermediates in metabolism, not the starting molecules entering glycolysis.
Conclude that glucose is the main carbohydrate molecule that enters glycolysis as the primary reactant after digestion of dietary carbohydrates.