Chapter 8.1-Energry and Life
Chemical Energy In Cells
- Is stored as ATP
- Adenosine triphosphate
- Adenine, ribose, 3 phosphate groups
- Bonds in ATP can be broken to release
energy
- Is re-usable
- ATP can be re-formed to store energy over
and over
- Is similar to a rechargeable battery
Adenosine diphosphate
(ADP)
+
=
+
=
Phosphate group
(P)
Adenosine triphosphate
(ATP)
Autotrophs and Heterotrophs
- Autotrophs make their own
food
- Also called producers
- Photosynthesizers
- Heterotrophs eat or consume
food or nutrients
-
Also called consumers
Herbivores
Carnivores
Omnivores
- Autotrophs form the basis of
any chain, and make life on
Earth possible
Chapter 8.2 p. 232
An overview of photosynthesis
Photosynthesis Reaction
- Occurs in chloroplasts
- In symbols:
6CO2 + 6H2O + light → C6H12O6 + 6O2
- In words:
Carbon Dioxide + Water + Light → Sugar + Oxygen
Chapter 9.1 p. 251
An overview of cellular respiration
Cellular Respiration Reaction
- Occurs in mitochondria
- In symbols:
6O2 + C6H12O6 + → 6H2O + 6CO2 + ATP
- In words:
Oxygen + Sugar (Glucose) → Carbon Dioxide + Water + Energy
Chapter 9.1 p. 253
Comparing photosynthesis and
cellular respiration
Comparing Photosynthesis and Cellular Respiration
Photosynthesis
Cellular Respiration
- Removes CO2 from
the atmosphere
- Releases O2 into
the atmosphere
- Turns CO2 into food
(sugar)
- Releases CO2 into the
atmosphere
- Removes O2 from the
atmosphere
- Uses O2 to turn sugar
into energy