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Monday, October 5, 2015

Biology - Chapter 3
Energy For the Cells
Photosynthesis: Photosynthetic organisms use light energy, carbon dioxide and water
to make sugar (glucose) and oxygen
...
Gives plants their green
colour, and captures light energy from the red
and blue ends of the visible light spectrum and uses it to produce carbohydrates (glucose),
water, and carbon dioxide
...
Oxygen is released during this stage
...

In every plant there is an optimal
temperature where the
photosynthesis works best
...


C6H12O6 + 6O2 ——> 6CO2 + 6H2O
Carbohydrates are broken down to release energy in a 4
step process:
1) Glycolysis: In the cytosol, glucose is cut into 2 three
carbon molecules called pyruvic acid (2 ATP made)
2) Pyruvic Acid Breakdown: Pyruvic acid is broken down
and taken into mitochondria
3) Krebs Cycle: Further breaks down pyruvic acid (2 ATP
made)
4) Electron Transport Chain: 32 ATP made
1 Molecule Glucose = 36 ATP Molecules

ATP - The Energy For Life
ATP (Adenosine Triphosphate): Made in the mitochondria through cellular respiration, stores
energy in the bond between the last two phosphates
...


During cellular respiration, ADP is converted back to ATP

Global Implications
Canada’s main industries depend on photosynthesis and cellular respiration; agriculture,
forestry, fishing and mining
...

-Burning fossil fuels and removing rain forests(less photosynthesis) have also contributed to
CO2 levels
-1850 - 285ppm, 2015- 398ppm (CO2 in atmosphere)

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