(NEW!) Glycolysis Part 2 4 The Preparatory Phase & Questions

The video tutorial covers glycolysis, focusing on its two main phases: the preparatory (investment) phase and the payoff phase. It explains the role of key enzymes like hexokinase, phosphofructokinase, and aldolase in the glycolytic pathway. The tutorial emphasizes the structural and logical understanding of glycolysis, detailing the conversion of glucose to fructose and the subsequent cleavage into three-carbon fragments. The video concludes with review questions to reinforce learning.

What is the primary purpose of glycolysis?

• To synthesize glucose from smaller molecules

• To produce oxygen from glucose

• To break down glucose into two three-carbon fragments

• To convert glucose into glycogen

What does hexokinase do in the first step of glycolysis?

• Converts glucose to fructose

• Adds a phosphate group to glucose

• Removes a phosphate group from glucose

• Converts glucose to glycogen

What is the role of phosphofructokinase in glycolysis?

• It converts glucose to glucose 6-phosphate

• It converts DHAP to G3P

• It splits fructose 1,6-bisphosphate into two three-carbon fragments

• It is the rate-limiting step that adds a second phosphate to fructose 6-phosphate

Which enzyme is responsible for splitting fructose 1,6-bisphosphate into two three-carbon fragments?

• Hexokinase

• Triose phosphate isomerase

• Phosphofructokinase

• Aldolase

What happens to DHAP in glycolysis?

• It is converted to glucose

• It is directly used in the payoff phase

• It is stored as glycogen

• It is converted to G3P by triose phosphate isomerase

Where does glycolysis occur in the eukaryotic cell?

• Mitochondria

• Cytosol

• Endoplasmic reticulum

• Nucleus

How many ATP molecules are consumed during the investment phase of glycolysis?

• 4 ATP

• 3 ATP

• 2 ATP

• 1 ATP

Which of the following sugars can be catabolized through glycolysis?

• Ribulose

• Xylose

• Galactose

• Ribose

What is the net gain or loss of ATP in the investment phase of glycolysis?

• Net loss of 4 ATP

• Net gain of 2 ATP

• Net loss of 2 ATP

• Net gain of 4 ATP

What is the final product of the investment phase that continues into the payoff phase?

• Glucose

• Glyceraldehyde 3-phosphate (G3P)

• Dihydroxyacetone phosphate (DHAP)

• Fructose 1,6-bisphosphate