BIO-1801 Lecture Notes - Lecture 15: Photosystem I, Photophosphorylation, Light-Independent Reactions

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19 Mar 2017
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Chapter 8 - Photosynthesis
Use energy from the sun to create glucose, a very high energy molecule.
Organisms who do this are producers aka autotrophs
these organisms produce carbohydrates
Heterotrophs, break down using
store energy, release potential energy which will be used for metabolism
photosynthesis, linking of exergonic reactions to endergonic reactions
Photosynthesis
energy within light is captured and used to synthesize carbohydrates
6CO2 + 12H2O + light energy yields C6H12O6 + O2 + H2O
delta G = +685 k/cal
oxygen is a by product of this reaction
CO2 is reduced
H2O is oxidized
Exergonic reactions in one phase drives endergonic reactions in another
focus on glucose
carbon dioxide provides substrate carbon which is reduced, and water is oxidized, that
will realize oxygen and then we have to use water to get electrons, therefore there
are two oxidation reduction reactions
taking exergonic reaction in one phase drives endergonic reactions in another
bacteria were the first to produce photosynthesis
oxygen would get into the atmosphere, it began to form ozone
ozone is critical, until ozone was created, no organism could exist on the surface of the planet
until ozone due to uv radiation
Aerobic respiration
wasnt possible until oxygen was around
Clicker Question: The production of O2 as a by-product of photosynthesis was crucial to earth
because
Ozone allowed colonization of land because it allowed organisms to come out of the water
use light energy to generate organic molecules glucose and oxygen, and then will be used in
cellular respiration
Chloroplast
where photosynthesis occurs
Chloroplast
Top
_____________________
oooooooooooooooooo
__ ___ ___ __ __ __ _ _ __ bottom
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Document Summary

6co2 + 12h2o + light energy yields c6h12o6 + o2 + h2o delta g = +685 k/cal oxygen is a by product of this reaction. Clicker question: the production of o2 as a by-product of photosynthesis was crucial to earth because. Ozone allowed colonization of land because it allowed organisms to come out of the water: use light energy to generate organic molecules glucose and oxygen, and then will be used in cellular respiration where photosynthesis occurs, chloroplast, chloroplast. __ ___ ___ __ __ __ _ _ __ bottom stomata are the openings in the bottom, mesophyll are the ooooooo. Thylocoid has the thylocoid membrane, what surrounds the sack has the thylocoid lumen, inside. Grana = stacks of thyroid surrounded by a liquid portion called the stroma. Compartmentalized process reactions occur in compartments to achieve the entire process. Clicker question: chlorophyll a and b are found in mesophyll cells because that"s where the chloroplasts are.

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