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. 232An 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. 251An 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. 253Comparing photosynthesis and cellular respiration

Comparing Photosynthesis and Cellular Respiration

Photosynthesis- Removes CO2 from

the atmosphere- Releases O2 into

the atmosphere- Turns CO2 into food

(sugar)

Cellular Respiration- Releases CO2 into the

atmosphere- Removes O2 from the

atmosphere- Uses O2 to turn sugar

into energy