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1. A calorie is a unit of energy
2. The Calorie used on food
labels is equal to 1000 calories
3. A Calorie is also referred to as
a kilocalorie
4. Cells use the energy stored in
ATP
(They get ATP by taking in foods
or storing molecules, such as fat)
5. The equation that summarizes
cell respiration
Look familiar? It’s photosynthesis backwards (almost exactly)
6 H2O + 6 CO2  C6H12O6 + 6 O2
6. If cell respiration took place in
one step most of the energy
would be lost in the form of light
and heat
7. Cell respiration begins with a
pathway called glycolysis which takes
place in the cytoplasm of the cell
8. At the end of glycolysis about
90 percent of the chemical
energy is locked in the bonds of
the pyruvic acid molecule
9. Cell respiration continues in
the mitochondria of the cell
with the Krebs cycle and
electron transport
10. The pathways of cellular
respiration that require oxygen are
said to be aerobic
Pathways of cellular respiration
that do not require oxygen are said
to be anaerobic
11.
12. Opposite directions
Notice the products of one reaction are the reactants of the
other, and vice versa!
13. Photosynthesis deposits
energy in Earth’s savings account
for living organisms
14. Cellular respiration removes
oxygen from the air
15. Cell respiration takes place
in nearly all life.
Only plants, fungi, and some bacteria use photosynthesis!
16. Comparing photosynthesis
and respiration !!!!!!!!!!!!!!!
Aspect
Photosynthesis
Respiration
Function
Captures energy
Location of
reactions
chloroplasts
Uses/releases
energy
Cytoplasm
mitochondria
Reactants
Carbon dioxide
Water and light
Glucose and oxygen
Products
Oxygen and
glucose
Carbon dioxide
Water and energy
17.
• Cellular respiration – releases energy for
use by cells
• Without energy, cells cannot function
• Without cells, life could not exist