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Lecture 12

BIO SCI 93 Lecture Notes - Lecture 12: Atp Synthase, Cellular Respiration, Thylakoid


Department
Biological Sciences
Course Code
BIO SCI 93
Professor
Jorge Busciglio Kim Green Marcelo A Wood
Lecture
12

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Photosynthesis- Lecture 12 (Pgs. 185-207)
Photosynthesis: the process by which light is converted to chemical energy (stored in
sugar and other molecules)
Converts solar energy→ chemical energy
Source of oxygen and reduced carbon for all other forms of life (basis of life for
higher trophic levels) PLANTS ARE PRIMARY!!
Reciprocal of cellular respiration
6CO2 + 6H2O → C6H12O6 + 6O2
Carbon dioxide reduced, water oxidized
light→ chemical energy
Autotrophs/ Photoautotrophs
Heterotrophs
Producers- plants, protists, algae,
cyanobacteria
Consumers- animals, fungi, many bacteria
Energy from light (sun)
Carbon dioxide from air
Obtain organic material from other organisms
Depend on phototrophs for food and oxygen
Water and minerals from soil
PLANTS ALSO HAVE MITOCHONDRIA SO THEY PERFORM CELLULAR
RESPIRATION AS WELL!!!
Chloroplasts- Site of photosynthesis
Green bc of chlorophyll molecules in the thylakoid membrane
Violet-blue/ red wavelengths work the best of photosynthesis
Chlorophyll molecule
Porphyrin head- absorbs light
Hydrocarbon tail- interacts with hydrophobic regions of proteins inside
thylakoid membranes of chloroplasts
Light
reactions
(thylakoid)
Light particle is absorbed by chlorophyll (photosystem II) and excites
an electron. It shoots up and travels down the electron transport chain
Water is broke up into O2 and 2H+ to replace the electron that left
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