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Overview of Cellular
PGS. 131-134
Review of Photosynthesis
Step 1: Light Reaction
•Light is absorbed by chlorophyll in the
•Water molecules are split in the ETC. This
• i. H+ and electrons (e-)
• ii. Oxygen gas is released
• iii. ATP and NADPH are made
Step 2: Calvin Cycle
•This reaction uses:
• ATP and NADPH from the
Light Reaction and CO2 from
the atmosphere
•The product is glucose (C6H12O6)
What happens to the glucose?
•Some will be used for energy for the
•The unused (excess) will be stored as
starch (ex: potatoes)
Cellular Respiration
•Using glucose to produce ATP
for cells
•Occurs in the cytoplasm and
Cellular Respiration Overall Equation:
C6H12O6 + 6O2  6CO2 + 6H2O + ATP Energy
***Memorize this equation***
Two Types of Cellular Respiration
1. Aerobic: needs O2; produces 38 ATP’s for
each glucose molecule.
• Type of respiration most organisms use
Two Types of Cellular Respiration
2. Anaerobic: does NOT need O2, produces 2 ATP’s for each
glucose molecule.
• Bacteria living in environments with no O2
• Yeast undergoing fermentation
• Muscles that have a lack of oxygen, also produces lactic acid
which causes sore muscles
If an organism lived in an O2 deficient environment it would
undergo the _____________ pathway.