Glycolysis Pathway | Enzymes, Regulation and Products

The video provides a comprehensive overview of glycolysis, a metabolic pathway that breaks down glucose to produce ATP. It occurs in the cytosol and is crucial in conditions where oxygen is limited or mitochondria are absent. The glycolytic pathway consists of 10 steps, including three irreversible enzymatic reactions. The video explains the two stages of glycolysis: energy consumption and energy acquisition. It also covers the regulation of glycolysis by various factors, including ATP, citrate, and hormones like insulin and glucagon. The net products of glycolysis are 2 ATP, 2 NADH, and 2 pyruvate molecules.

What is the primary function of glycolysis in cells?

• To convert glucose into fatty acids

• To store glucose as glycogen

• To break down glucose for ATP production

• To synthesize glucose

Which enzyme is responsible for the phosphorylation of glucose in the glycolytic pathway?

• Phosphofructokinase

• Hexokinase

• Pyruvate kinase

• Aldolase

What is the role of glucose 6 phosphate in regulating hexokinase?

• It activates hexokinase

• It inhibits hexokinase

• It has no effect on hexokinase

• It converts hexokinase to glucokinase

Why is phosphofructokinase 1 considered a committed step in glycolysis?

• It is the first step in glycolysis

• It produces the most ATP

• It is reversible

• It commits the substrate to continue through glycolysis

Which molecule acts as a potent activator of phosphofructokinase 1?

• NADH

• Citrate

• Fructose 2,6-bisphosphate

• ATP

What is the significance of the enzyme aldolase in glycolysis?

• It synthesizes ATP

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

• It converts pyruvate to lactate

• It phosphorylates glucose

How many ATP molecules are produced in the latter half of glycolysis?

• Six

• Two

• One

• Four

What is the net gain of ATP molecules from one molecule of glucose in glycolysis?

• Four

• Three

• Two

• One

Which of the following is NOT a product of glycolysis?

• FADH2

• Pyruvate

• NADH

• ATP

What happens to NADH produced during glycolysis under anaerobic conditions?

• It is stored in the cell

• It is converted to FADH2

• It enters the electron transport chain

• It is converted back to NAD+ by lactate dehydrogenase