Bio 204 Photosynthesis
1. Autotrophs vs. Heterotrophs: Autotrophs - "self feeders" that produce organic compounds (key
example - glucose)
Heterotrophs - organisms who must obtain their energy source by ingesting or absorbing nutrients from other living
things
2. anatomy of chloroplast:
3. photosynthesis: redox reaction, splits two H2O into H and O and combines electrons of hydrogen with CO2
to make sugar
two stages
light reactions: in thylakoids
-light energy transformed into chemical energy
-oxidizes H2O and releases O2,
-reduces NADP+ to NADPH
Calvin cycle: in stroma
-synthesizes sugar from CO2 using ATP and NADPH
1/4
, 4. photosynthesis part2:
5. EM spectrum: different colors will interact differently with pigments because of waveleng th/energy level
6. photosynthetic pigments: Chemicals that absorb light energy and use it to carry out photo synthesis.
xcited state
-Chlorophyll a, main photosynthetic pigment, contains a porhyrin ring, will interact with specific wv of light
-excite electrons from ground to excited, excitation energy has to match the quantum energy level to get to e
7. acessory pigments: pigments that indirectly enhance photosynthesis by absorbing specific wavelengths of
light and transferring this energy to chlorophyll molecules that are directly involved
2/4
1. Autotrophs vs. Heterotrophs: Autotrophs - "self feeders" that produce organic compounds (key
example - glucose)
Heterotrophs - organisms who must obtain their energy source by ingesting or absorbing nutrients from other living
things
2. anatomy of chloroplast:
3. photosynthesis: redox reaction, splits two H2O into H and O and combines electrons of hydrogen with CO2
to make sugar
two stages
light reactions: in thylakoids
-light energy transformed into chemical energy
-oxidizes H2O and releases O2,
-reduces NADP+ to NADPH
Calvin cycle: in stroma
-synthesizes sugar from CO2 using ATP and NADPH
1/4
, 4. photosynthesis part2:
5. EM spectrum: different colors will interact differently with pigments because of waveleng th/energy level
6. photosynthetic pigments: Chemicals that absorb light energy and use it to carry out photo synthesis.
xcited state
-Chlorophyll a, main photosynthetic pigment, contains a porhyrin ring, will interact with specific wv of light
-excite electrons from ground to excited, excitation energy has to match the quantum energy level to get to e
7. acessory pigments: pigments that indirectly enhance photosynthesis by absorbing specific wavelengths of
light and transferring this energy to chlorophyll molecules that are directly involved
2/4
