Multiple Choice
In glycolysis, what is the role of produced by glyceraldehyde-3-phosphate dehydrogenase?
11
views
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway
Glycolysis 1
Multiple Choice
In glycolysis, which molecule is the initial substrate that enters the pathway and is phosphorylated by hexokinase (or glucokinase in liver)?
A
Glycogen
B
Fructose , (fructose 1,6-bisphosphate)
C
Pyruvate
D
Glucose
Verified step by step guidance1
Identify the starting point of glycolysis, which is the molecule that enters the pathway first and undergoes phosphorylation.
Recall that hexokinase (or glucokinase in the liver) catalyzes the phosphorylation of this initial substrate, adding a phosphate group to it.
Understand that glycogen is a storage polysaccharide and does not directly enter glycolysis; it must first be broken down into glucose units.
Recognize that fructose 1,6-bisphosphate is an intermediate formed later in glycolysis, not the initial substrate.
Conclude that glucose is the initial substrate that enters glycolysis and is phosphorylated by hexokinase or glucokinase, making it the correct answer.
Related Videos
Related Practice
