Steps of Glycolysis
Detailed biochemical reactions, enzymes involved, and intermediate compounds formed during the ten steps of glycolysis.
What is Steps of Glycolysis?
A metabolic pathway that converts glucose into pyruvate, releasing energy that is captured by the temporary storage in energy-carrying molecules such as ATP and NADH.
Key formula / rule: Overall Glycolysis Reaction
Key points
- Describe the overall process of glycolysis.
- Identify the starting material and end products.
- List the ten enzymatic steps and key intermediates.
- Differentiate between the energy investment and payoff phases.
Common exam trap
Confusing the number of ATP produced versus net gain.
Definitions
- Term
Glycolysis
- Meaning
A metabolic pathway that converts glucose into pyruvate, releasing energy that is captured by the temporary storage in energy-carrying molecules such as ATP and NADH.
- Term
ATP (Adenosine Triphosphate)
- Meaning
The primary energy currency of the cell, used to power most cellular activities.
- Term
NADH (Nicotinamide Adenine Dinucleotide)
- Meaning
An electron carrier that stores energy derived from the breakdown of glucose and transfers it to the electron transport chain.
- Term
Pyruvate
- Meaning
A three-carbon molecule that is the end product of glycolysis.
- Term
Substrate-level phosphorylation
- Meaning
The direct transfer of a phosphate group from a substrate molecule to ADP to form ATP.
Learning objectives
Describe the overall process of glycolysis.
Identify the starting material and end products.
List the ten enzymatic steps and key intermediates.
Differentiate between the energy investment and payoff phases.
Explain the net ATP and NADH production.
Recognize the regulatory points of the pathway.
Formulae
- Name
Overall Glycolysis Reaction
- Note
Represents the net conversion of glucose to pyruvate with associated energy molecules.
- Expression
C6H12O6 + 2 NAD+ + 2 ADP + 2 Π → 2 CH3COCOO− + 2 NADH + 2 H+ + 2 ATP + 2 H2O
Prerequisites
Basic understanding of carbohydrates (glucose structure).
Knowledge of enzymes and their role in catalysis.
Concept of ATP as an energy currency.
Understanding of oxidation-reduction reactions (NADH formation).
Common mistakes
Confusing the number of ATP produced versus net gain.
Forgetting that glycolysis occurs in the cytoplasm, not mitochondria.
Not remembering the key regulatory enzymes.
Mixing up the order of intermediate compounds.
Assuming oxygen is required for glycolysis itself.
Keywords
Glycolysis
Glucose
Pyruvate
ATP
NADH
Cytoplasm
Anaerobic
Cellular Respiration
Enzymes
Hexokinase
PFK-1
Pyruvate Kinase
Energy Investment Phase
Energy Payoff Phase
Substrate-level phosphorylation
Practice preview
How many net ATP molecules are produced during the complete process of glycolysis from one molecule of glucose?…
easy
Where does the process of glycolysis primarily occur within a eukaryotic cell?…
easy
What is the enzyme responsible for the first step of glycolysis, converting glucose into glucose-6-phosphate?…
easy