1. Photosynthesis
Defined: process by which light energy is converted to chemical energy.
Is this an example of metabolism?
Is this a chemical reaction?
Autotrophs: self feeding
Energy: ATP

3. Light- Absorbing Structures
Pigments: molecule that contains a light- absorbing structure
Chlorophyll: primary pigment involved with photosynthesis
Carotenoids: secondary pigments in photosynthesis

4. Color- absorption vs. reflection
What visible light colors (wavelength) does chlorophyll A and B absorb? Reflect?
If a color is absorbed, can it be reflected?

5. Discuss class graphs and why we only had small peaks.

6. Infrared (IR) light Invisible to human eye “Night Vision”
“Thermographic” cameras

7. Cyanobacteria Photosynthetic Bacteria Prokaryotes Lack organelles
Single celled

8. Who came first?

9. Endosymbiosis
Video

12. Recap Story of Life Atoms  Molecules
Molecules  Organic compounds: monomers
Monomers  Polymers
Amino acids  protein and enzymes
Glycerol & fatty acids  lipids
Phospholipids  selective permeability
Maintain Homeostasis
Photosynthesis- Carry out Metabolic Reactions

13. Photosynthesis Stages
6CO2 + 6H2O + light energy  C6H12O6 + 6O2
Stages of Photosynthesis:
Absorb light energy (via pigments)
Convert light energy  chemical energy
Convert chemical energy  organic compounds

14. Photosynthesis Calvin Cycle (Light- Independent) Light Reaction Steps
Occurs in the Thylakoid Membrane  Chloroplast
Light energy is absorbed
Water molecules are split into H+ ions, O- and e-.
O- combine to form O2 that diffuses out of thylakoid membrane
H+ ions travel down concentration gradient through the transport protein ATP synthase via facilitated diffusion.
ATP synthase uses energy from H+ gradient to combine ADP + Pi  ATP (chemical energy)
Light energy excites electrons, which bounce through the Electron Transport Chain (ETC) and land on NADP+ reductase, enzyme.
NADP+ reductase combines e- + NADP+  NADPH
Inputs: H2O + light energy
Intermediates: H+ ions, Oxygen and Electrons
Outputs: ATP and NADPH
Occurs in the stroma  chloroplast
CO2 is added to a 5-C compound via enzyme RuBisCO to make a 6-C compound.
The resulting 6-C compound splits into two 3- C compounds; phosphates from ATP and electrons from NADPH are added.
One of the 3-C compounds is used to make C6H12O6, a sugar to store energy for plant.
The other 3-C compound gets recycled back into the mix to keep cycle going.
Inputs: ATP, NADPH and CO2
Intermediates: 3- carbon sugar
Outputs: C6H12O6

17. 6. 7. 6. 2. 3. 4. 5.

18. organic compounds: sucrose, starch Unstable 6 carbon compound
3 carbon simple
sugar (recycled)
organic compounds: sucrose, starch
Unstable 6 carbon compound
RuBisCO
+ 5 carbon compound