Questions? Comments? Please contact Dr. Phillip McClean or Christina Johnson.

OVERVIEW
Flythrough Tour
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MOLECULAR PROCESSES
Transcription
Regulated Transcription
mRNA Processing
mRNA Splicing
Translation
Lac Operon
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CELLULAR PROCESSES
Protein Trafficking
Protein Modification
Protein Recycling
Insulin Signaling
Constitutive Secretion
Regulated Secretion
Mitochondrial Protein Transport
Mitosis
Meiosis
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CELLULAR ENERGY CONVERSION
Atp Synthase (Gradients)
Electron Transport Chain
Photosynthesis (Light Reaction)
Photosystem II
Glycolysis (Overview)
Glycolysis (Reactions)
Citric Acid Cycle (Overview)
Citric Acid Cycle (Reactions)
Energy Consumption
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HOME > GLYCOLYSIS OVERVIEW> A CLOSER LOOK
Glycolysis Overview: First Look

Glycolysis is an important cellular pathway that occurs in almost all organisms. It both consumes and produces cellular energy in the form of ATP and NADH. Clicking on each of the thumbnail images will bring up a larger, labeled version of the described scene.

To see the Flash movie for the following sequence of images, click here.

The first five steps of glycolysis convert one six-carbon glucose into two three-carbon glyceraldehyde 3-phosphate (G3P) molecules.

To complete this conversion, one molecule of ATP is consumed during step one and step three. Both of these reactions are catalyzed by kinase enzymes and are irreversible.

Because the original glucose molecule is broken down into two G3P molecules, all of the reactions in the second half of gylcolysis occur two times.

This results in two ATPs being produced at both steps 7 and 10. Step 7 is reversible, while step 10 is not.

All of the compounds produced in the second half of glycolysis are made for each of the two molecules of G3P. This includes ATP as well as NADH.

Because two molecules of ATP were consumed in the first half of glycolysis, and four molecules of ATP were produced in the second half, glycolysis results in a net gain of two ATPs.

The NADH created in the second half of glycolysis can be used by other cellular processes such as cellular respiration to produce even more ATP for the cell.

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