1. Chapter 8 Photosynthesis
8.1 Energy and Life
10/27/2005

2. What is Energy?
Ability to do work

3. Autotrophs vs. Heterotrophs
Makes their own food
Use the energy of the sun
Ex. Plants
Obtains energy from the foods they consume

4. ATP Adenosine TriPhosphate Made up of: Adenine 5 Carbon sugar (ribose)
Three phosphate groups
KEY TO STORE & RELEASE ENERGY

5. Storing Energy ADP (Adenosine DiPhosphate) Similar to ATP
2 phosphate groups
Key to the way in which living things store energy
Add on available energy with a phosphate to ADP to create ATP
Analogy --> Battery

6. Releasing Energy How is the energy stored in ATP released?
Breaking the chemical bond between the second and third phosphate group
Basic energy source of all cells

7. What is energy used for?
Carry out active transport
protein synthesis
Responses to chemical signals

8. ATP
can only pack small amounts of energy

9. Adenine P
Phosphate
Ribose
ADP

10. Adenine
Phosphate P P P
Ribose
ATP

11. 8.2 Photosynthesis: An Overview

12. Photosynthesis key cellular process identified with energy production
Who goes through photosynthesis?
PLANTS

13. Photosynthesis Equation
REACTANTS
LIGHT
6CO2
6H2O +
Carbon dioxide
Water

14. Photosynthesis Equation
PRODUCTS
Sugar
Oxygen
LIGHT
C6H12O6 +
6O2

15. Photosynthesis Equation
LIGHT
6CO2 +
6H2O
C6H12O6 +
6O2
DESCRIBE WHAT IS HAPPENING IN THE REACTION.
In photosynthesis, plants use the energy of sunlight to change water and carbon dioxide into high-energy sugars and oxygen.

16. Lights and Pigments Plants need Light Form of energy Pigment
light absorbing molecule
Chlorophyl
Principal pigment in plants

17. 8.3 The Reactions of Photosynthesis

18. Chloroplast where photosynthesis takes place
thylakoid membranes = saclike photosynthetic materials found in chloroplast

19. Chloroplast Granum = stack of thylakoid
photosystems = organization of chlorophyll and other pigments
light collecting units of the chloroplast

20. Photosystems 2 part process Light dependent In the thylakoid membranes
Light independent (Calvin cycle)
In the stroma
Region outside the thylakoid membranes

22. Electron Carriers Sunlight excites electrons in chlorophyll
electrons gain tons of energy
high energy electrons need special carriers from chlorophyll to other molecules

23. Light Dependent Reactions
requires lights
uses energy from light to produce ATP and NADPH

24. Light Dependent Reactions
Products
OXYGEN GAS (02)
2 energy carriers
ADP -- > ATP
NADP+ --> NADPH

25. Light Dependent Reaction
5. ATP Formation
ATP Synthase = protein on cell membrane
Allows H+ to pass through membrane
ATP Synthase binds ADP + P+, creating ATP

26. Light Dependent Reactions
Products
OXYGEN GAS (02)
2 energy carriers
ADP -- > ATP
NADP+ --> NADPH