photosynthesis power point notes
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Photosynthesis
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Energy
Thermodynamics study of theflow and transformation of
energy in the universe. Law 1 law of conservation ofenergy energy cannot becreated nor destroyed.
Law 2 of Thermodynamics energy cannot be convertedwithout the loss of usable energy. For example the food chain, energy
decreases
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Autotrophs Organisms that useenergy from sunlight orother inorganic
substances to makeorganic compounds
Heterotrophs Organisms that rely onconsuming organiccompounds that can be
converted into energy.
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6CO2 + 6H2O + LIGHT C6H12O6 + 6O2
CARBON WATER ENERGY 6-CARBON OXYGEN
DIOXIDE SUGAR GAS
Plants are the only photosynthetic
organisms to have leaves (and not allplants have leaves). A leaf may be viewedas a solar collector crammed full ofphotosynthetic cells.
The raw materials of photosynthesis, waterand carbon dioxide, enter the cells of theleaf, and the products of photosynthesis,sugar and oxygen, leave the leaf.
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Process by which green plants and some
bacteria manufacture carbohydrates from
water and atmospheric carbon dioxide, using
the energy of sunlight. Photosynthesis
depends on the ability of chlorophyll
molecules within plant cells to trap the
energy of light.
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ATP, adenosine triphosphate is the primary source of energy required for all living cells. Energy is produced when ATP loses a phosphate molecule,
and is reduced to adenosine diphosphate (ADP).
ATP animation
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The Process of PHOTOSYNTHESIS CAN BE SUMMARIZED BY THE FOLLOWING EQUATION:
6CO2 + 6H2O + LIGHT C6H12O6 + 6O2
CARBON WATER ENERGY 6-CARBON OXYGEN
DIOXIDE SUGAR GAS
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Stage one, Light Energy is absorbed.
Light reactions reactions where light energy is
converted to chemical energy
Chlorophyll absorbs mostly blue and red light and
reflect green and yellow2 types of chlorophyll chlorophyll a and chlorophyll
b
Carotenoids pigments that produce yellow and
orange fall leaf colors, as well as, colors of fruits and
vegetables.
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The Carotenoids in Green Leaves are usually masked by Chlorophylls
until Autumn when Chlorophylls break down
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NADPH
Nicotinamide adenine dinucleotide
phosphate that serves as an electron carrier.
NADPH and ATP are used to synthesize
organic molecules from CO2.
Another important aspect of energy
Changes from NADPH (electron full) to
NADP+ (empty) and in reverse.
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The Process of Photosynthesis does NOT Happen all at Once;rather it occurs in THREE STAGES: STAGE 1 Called the LIGHT DEPENDENT REACTIONS.
Energy is Captured from Sunlight.
Water is Split into Hydrogen Ions, Electrons, and Oxygen. STAGE 2 - The Light Energy is Converted to Chemical Energy,
which is temporarily stored in ATP and NADPH.
STAGE 3 - CALLED THE CALVIN CYCLE. The Chemical
Energy Stored in ATP and NADPH powers the formation of Organic
Compounds (Sugars), using Carbon Dioxide, CO2.
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Light Reactions
In the Light Dependent Processes (Light Reactions)light strikes chlorophyll a in such a way as to excite
electrons to a higher energy state. Water is split in
the process, releasing oxygen as a by-product of the
reaction.
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Chlorophyll absorb photons of light, exciting chlorophyll electrons to
a higher energy level. This charge separation drives the splitting of
water molecules to make oxygen (O2), protons (H+) and electrons
(e ):
H2O O
2+ 4H+ + 4e-
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Stage 2, Light energy is converted to chemical energy
Electron Transport Chain series of molecules through which
excited electrons are passed along a thylakoid membrane. Light
reactions produce Oxygen as a by product. The Oxygen is not
from the CO2 but from the splitting of the water molecules.
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Electron Transport chain animation
Photosynthesis
http://vcell.ndsu.nodak.edu/animations/photosyn
http://www.science.smith.edu/departments/Biology/Bio231/ltrxn.htmlhttp://www.glencoe.com/sec/science/cgi-bin/splitwindow.cgi?top=http://www.glencoe.com/sec/science/top2.html&link=http://www.stolaf.edu/people/giannini/flashanimat/metabolism/photosynthesis.swfhttp://vcell.ndsu.nodak.edu/animations/photosynthesis/movie.htmhttp://vcell.ndsu.nodak.edu/animations/photosynthesis/movie.htmhttp://www.glencoe.com/sec/science/cgi-bin/splitwindow.cgi?top=http://www.glencoe.com/sec/science/top2.html&link=http://www.stolaf.edu/people/giannini/flashanimat/metabolism/photosynthesis.swfhttp://www.science.smith.edu/departments/Biology/Bio231/ltrxn.htmlhttp://search.msn.com/images/details.aspx?q=daisies&color=both&size=1p&ht=452&wd=320&tht=128&twd=90&su=http%3A%2F%2Fwww.popartuk.com%2Fphotography%2Ffour-daisies-5046-poster.asp&iu=http%3A%2F%2Fwww.popartuk.com%2Fg%2Fl%2Flg5046.jpg&tu=http%3A%2F%2Fimages.picsearch.com%2Fis%3F867570791720&sz=31 -
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Electron Transport Chain
1. Light hits the chloroplast, the electrons are excited
and move down the membrane.
2. As they pass through a protein, energy is lost. This
lost energy is used to pull H+ across. H+ is fromthe splitting of H2O.
3. H+ more concentrated inside the thylakoid causing
a concentration gradient. This might cause the H+
to diffuse out of the thylakoid.4. As the H+ diffuse out, a phosphate group is
released to bond with ADP to form ATP.
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Second electron chain
1. Provides NADPH electron carrier that
provides the high energy electrons needed to
make carbon- hydrogen bonds.
2. As light hits the thylakoid, the electrons areexcited. Excited electrons combine with
hydrogen ions as well as an electron
acceptor called NADP + H, forming
NADPH.3. Outcome of Electron chain Produces
energy that is used in stage 3
6H2O + 6CO
2----------> C
6H
12O
6+ 6O
2
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Stage 3, Energy is stored in Organic compounds
Calvin cycle or Carbon dioxide fixation
http://www.science.smith.edu/departments/Biology/Bio231/calvi
What do I have to know?
CO2 is used in this stage of photosynthesis
Organic compounds such as carbohydrates, such as starch
and sucrose is made
The energy used to create these organic compounds are
made from the 2 previous stages.
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8/2/2019 Photosynthesis Power Point Notes
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8/2/2019 Photosynthesis Power Point Notes
21/22
Factors that affect photosynthesis
1. Light intensity
2. CO2 concentration
3. Of course, H2O also.
6H2O + 6CO
2----------> C
6H
12O
6+ 6O
2
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8/2/2019 Photosynthesis Power Point Notes
22/22
And that is photosynthesis whew!
That was a doozie.
I dont know about you but I think I
could go through that again so I canget a better understanding.
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