This slideshow is intended for students in Mr. Hildebrandt's biology classes.

1. Cellular Ener g y
Needs
Biology
Mr. Hildebrandt

2. All Living Cells Need
Energy
 Cells either make
their own food
(glucose) or obtain it.
 Autotrophic cells
convert sunlight into
glucose
 Heterotrophic cells
have to obtain
glucose by other
means.

3. Energy Storage
Molecules
 Glucose is turned
into energy storage
molecules called
ATP.
 ATP = Adenosine
Triphosphate
 When a phosphate
group is broken off,
energy is released

4. Chemical Reactions
 Reactants – substances that enter a
reaction. They are changed.
 Products – substances left after the
reaction has taken place.
 Two chemical reactions are
necessary for cells to produce
energy: Photosynthesis & Cellular
Respiration

6. Photosynthetic
Pigments
 Pigments are chemicals
that absorb light.
 Chlorophyll (A and B)
Primary pigments, green
in color.
 Anthocyanin – red/purple
 Carotene – orange
 Xanthophyll - yellow

7. Photosynthesis
Explained
 Takes place in
Chromoplasts within
autotrophic cells.
 Primarily the
Chloroplasts
 Reactants: Carbon
Dioxide & Water
 Products: Glucose &
Oxygen
 Driven by the sun

8. light
6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2

9. Cellular Respiration
Explained
 Process that releases energy (ATP)
by breaking down glucose
 Takes place in cells
mitochondria
 Reactants: glucose
& oxygen
 Products: H20, CO2
& ATP

10. Types of Cellular
Respiration
 Aerobic (sufficient O2) – very effective, 36
ATPs produced from one glucose:
C6H12O6 + 6O2 6CO2 + 6H20 + 36 ATP
 Fermentation (no O2) – not efficient
1. Alcoholic Fermentation: alcohol
and C02 are produced
2. Lactic Acid Fermentation: l. acid
produced