CELL ENERGY
Fermentation
Vs.
Respiration
“How Does a Cell Make Energy?”

Glucose is the source of energy for cells. This simple
sugar is broken down into an “energy-rich” molecule
known as ATP.

The more glucose a cell can obtain  -  -

A cell can produce ATP from glucose either -
CELL ENERGY KEY
Glucose
A simple sugar which provides energy for the cell
ATP
An “energy-rich” molecule created from glucose
Organic
Molecule
CO2
A product created by the reaction of glucose within the
cytoplasm
Carbon Dioxide; a waste product created during
fermentation and respiration
Oxygen; the organic molecule combines with oxygen to
produce more ATP in the cell’s mitochondrion
H2O
Water; a waste product created during respiration.
Fermentation (Anaerobic)
1. 2. Two waste products are released in the
process: 3. -
Fermentation (Anaerobic Respiration)
Cytoplasm
2 ATP
Glucose
Organic Molecule
CO2
1.
The Process of Respiration
(Aerobic)
Glucose enters the cell through the cell membrane, reacts with the
cytoplasm, and breaks down creating 2 ATP.
2. One waste product is created in this process: carbon dioxide (CO2)
which exits the cell.
3. An organic molecule is also created in this reaction which is able to
bond with oxygen (O2).
4. A new molecule is thus created (oxygen + organic molecule) and is
transported to the mitochondrion.
5. Once in the mitochondrion, the oxygen + organic molecule is
broken down to release 34 ATP molecules.
6. This reaction also produces two waste products, carbon dioxide
(CO2) and water (H2O) which exit the cell.
Aerobic Respiration
Cytoplasm
2 ATP
Glucose
CO2
Organic
Molecule
O2 + Organic
Molecule
34 ATP
CO2
H2O
Mitochondrion
Fermentation vs. Respiration the Facts!
Fermentation
(Anaerobic)
Respiration
(Aerobic)
• Primitive method; only 2
ATP per glucose molecule
• -
• NO oxygen
• -
• Wastes: CO2 and an
organic molecule
• -
• Simple organisms; bacteria • and fungi
Indicator


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