Cell Respiration and Photosynthesis

By: Melissa Moore

Cellular Respiration

Step 1: Glycolysis

------the breaking down of one glucose molecule into one pyruvate and 2 ATP molecules.

Step 2: Fermentation

------starts with the pyruvate and can either be changed into ethanol or lactate.

------releases CO2 but does not create ATP.

Step 3: Krebs cycle

------Acetyl-CoA joins a 4-carbon molecule creating a 6-carbon molecule

------The 6-carbon molecule then releases carbon creating 5-carbon molecule

------More carbon dioxide is released leaving a 4-carbon molecule, also creating ATP and NADH

------The old 4-carbon molecule is than changed into a new 4-carbon molecule. The electrons are then transferred to an electron acceptor called FAD creating a FADH+ molecule.

------The 4-carbon compound is than reused to start the Krebs Cycle

Step 4: Electron Transport Chain

------NADH and FADH2 pass through the electron transport chain

-------------in eukaryotes this is located in the inner membrane of the mitochondria

------this energy is used to pump hydrogen ions out of the inner membrane to the outer membrane

------They then diffuse back to the inner membrane through a carrier that adds a phosphate group to ADH making ATP.

------At the end of the ETC the hydrogen ions and spent electrons combine with oxygen molecules creating water molecules.

Cellular Respiration Equation

C6H12O6 + O2 = H2O + O2 + e
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Photosynthesis

Stage 1:

----The sunlight is captured in the plant

Stage 2:

----The light is then converted into chemical energy.

Stage 3:

----This energy powers the organic formation of glucose and oxygen, using carbon dioxide.

Photosynthesis Equation

CO2 + H2O = C6H12O6 + O2
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Photosynthesis and Cellular Respiration comparisons

Photosynthesis creates the compound used for cellular respiration. Cellular respiration creates the compounds used in photosynthesis.