Energy and photosynthesis
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Transcript of Energy and photosynthesis
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Energy and Life
Without the ability to obtain and use energy, life would
cease to exist.
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Chemical Energy & ATP
Energy comes in many forms:
Light
Heat
Electricity
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When a candle burns, what is happening?
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ATP
The principal chemical
compound used for energy.
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What is ATP?It contains the following:
Adenine
5 – Carbon Sugar (Ribose)
3 Phosphate GroupsAnalogy: ATP is like a ……
The three phosphate groups are key to storing and
releasing the energy of ATP.http://www.biologyinmotion.com/atp/index.html
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What is ADP?A battery that needs charged!!!
It is just like ATP, but is missing a phosphate group.
To store energy the third phosphate group is added to make ATP.
How does ATP release its energy?
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How Do Cells Use the Energy of ATP?
Active Transport – Pumps Na+ out of the cell and K+ into the cells to maintain ion balances.http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html
Motor Proteins – ATP gives these proteins the energy they need to move organelles around the cell.
Blink of a Firefly – ATP powers the enzymes that allow fireflies to blink
Protein Synthesis – Helps to bond amino acids together to make proteins..
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Why Do Cells Contain Only a Small Amount of DNA?
Cells only have enough ATP to fuel the cells for a few seconds.
ATP is great at transferring energy, but not at storing it.
Glucose stores 90x more energy the ATP!!
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Photosynthesis
Plants use the sun’s energy to convert CO2 &
H2O.
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Van Helmont’s Experiment
1600’s
He planted a seedling in a measured amount of soil. After 5 years, he had a small tree, but
the mass of the soil was unchanged.
What did he conclude?
He only added one thing to the seedling….
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Priestley’s Experiment
He put a glass jar over a candle. What happened?
Then he put a sprig of mint with the candle under the glass jar. What happened to the candle
this time?
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Jan Ingenhousz Experiment
He found that Priestly’s results were only valid if sunlight was present.
The work of the three men led to what we know about photosynthesis today……it requires light, and can turn
CO2 and H2O into sugars while giving off oxygen.
Once the glucose is made, it can be converted into complex starches.
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Light and Pigments of Photosynthesis
Pigment – light absorbing molecules found in autotrophs (absorb the energy with the light)
Chlorophyll – plants principal pigment (chlorophyll a & b) – reflects green wavelengths of light
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Structure of a ChloroplastThylakoids – sac – like photosynthetic membranes found in chloroplasts
Grana – stacks of thylakoids
Photosystems – clusters of pigments and proteins that absorb light energy in thylakoids
Stroma – outside the thylakoid membrane where Calvin Cycle occurs
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Light Dependent Reactions
Occurs only with sunlight.
Makes ATP & NADPH
Occurs in the Thylakoid Membrane
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Light Independent ReactionsCalvin Cycle
Don’t need sunlight
Makes the sugars (glucose)
Occurs in the Stroma
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Electron CarrieresLight “excites” electrons in chlorophyll. Theses excited elections are then carried from chlorophyll to OTHER MOLECULES.
Carrier Molecule – A compound that can accept a pair of high energy electrons and transfer the electron and their energy to another molecule.
Ex. NADP+ - A carrier Molecule
It becomes NADPH when it accepts electrons and their energy.
This energy is then used to build energy rich molecules.
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THE LIGHT DEPENDENT REACTIONS
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FIRST STEP
Photosystem II Pigments absorb sunlight. That
energy is absorbed by two electrons and passed to
the ELECTRON TRANSPORT CHAIN. (the carriers)
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SECOND STEP
These excited electrons are moved to
Photosystem I (with their energy). The energy is used to
transport H+ ions from the stroma to the thylakoid space.
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THIRD STEPIn Photosystem I, its
pigments absorb more light and reenergize the
electrons.
NADP+ picks up the electrons and H+ ions on
the surface of the thylakoid membrane and becomes
NADPH.
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FOURTH STEPAs the electrons are
passed from chlorophyll to NADP+, H+ ions are
pumped across the membrane. This makes
inside the thylakoid + and the outside -. This charge
difference produces energy to make ATP.
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FIFTH STEP
ATP Synthase in thylakoid membrane to allow H+ to pass
and adds a phosphate to ADP to
make ATP.
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The Calvin Cycle
ATP and NADPH will only remain stable for
a few minutes. The Calvin Cycle uses the ATP and NADPH from the light-dependent reactions to produce high-energy sugars.
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Step 1
3 CO2 molecules enter the cycle from the air and combine with 3, 5
carbon molecules (RuBP) .
The result is 6,3 carbon molecules
(PGA).
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Step 2
The 6, 3-carbon PGA molecules are
converted then to higher energy forms
by adding a phosphate group.
(energy comes from 6 ATPs and high energy electrons
form NADPH)
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1 of the 6, 3 carbon molecules (G3P) are
removed to make sugar, lipids, and
other compounds. Another 3 carbon G3P molecule is
need to make sugar. Hence, a repeat of
the cycle.
Step 3
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Step 4The 5 remaining 3 carbon molecules are converted into
5, 5 carbon molecules to be
reused in step 1. ADP and NADP+
will be reenergized in light reactions.
http://www.stolaf.edu/people/giannini/flashanimat/metabolism/photosynthesis.swf
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What Affect the Rate of
Photosynthesis?