atp, photosynthesis, and cellular respiration chapter 4 sections 4.1, 4.2, and 4.3
DESCRIPTION
This is how it works phosphate removed ATP gives off energy when a phosphate group is removed and it becomes ADPTRANSCRIPT
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ATP, Photosynthesis, and Cellular Respiration
Chapter 4 Sections 4.1, 4.2, and 4.3
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4.1 How do living things get ATP?
ATP is the energy carrier in living things.
ATP stands for Adenosine triphosphate.Living things get ATP from breaking down
carbon based molecules. (carbohydrates & lipids)Starch molecule
Glucose molecule
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This is how it works
phosphate removed
ATP gives off energy when a phosphate group is removed and it becomes ADP
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4.2 & 4.3 Photosynthesis
The process of photosynthesis captures energy from sunlight and converts it into sugar.
This process happens in organisms called autotrophs or producers. (Need to make their own food)
This process takes place in and organelle called the chloroplast.
The chloroplast has a green pigment in it called chlorophyll that is responsible for capturing the light energy.
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Let’s label the inside of a chloroplast
C6H12O6
Contains: chlorophyll
4. thylakoidsunlight
1 six-carbon sugar
3. 6H2O
7. 6CO2 from the atmosphere
5. 6O2
chloroplast2
9
6. Energy carrying molecules are being transferred to light independent reactions
stroma (fluid outside the thylakoids)
8. Light independent reaction
1.
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So how does photosynthesis work?
The first stage of photosynthesis is called the Light Dependent Stage.
Light and water are used to produce ATP and oxygen is released
Occurs on the thylakoid membranes inside chloroplasts
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So how does photosynthesis work?
The second stage of photosynthesis is called the Light Independent Stage/ Calvin Cycle/ Dark Cycle.
This process takes place in the stroma.Carbon dioxide (CO2) is added from the
atmosphere to help in chemical reactions to produce glucose (C6H12O6)
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The chemical formula for photosynthesis
6CO2 + 6H2O + light C6H12O6 + 6O2
(reactants) (products)
Carbon dioxide plus water plus light
yields Glucose and oxygen
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Cellular Respiration & Fermentation4.4, & 4.6
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4.4 & 4.6 – Overview of Cellular Respiration & Fermentation
Key Concept:The overall process of cellular
respiration converts sugar into ATP using oxygen.
Cellular respiration is an aerobic process with two main stages.
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Purpose of Cellular Respiration
To make ATP from the energy stored in glucose
Remember: the purpose of photosynthesis was just to get glucose
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Cellular Respiration has 2 parts
Anaerobic (does not require oxygen)Glycolysis
Aerobic (requires oxygen)Kreb’s Cycle (Citric acid Cycle)Electron Transport Chain (ETC)
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4. 6CO2
6. ETC: energy from glycolysis and 6O2 enter
1. mitochondrion
matrix (area enclosedby inner membrane)
inner membrane
ATP
ATP
5. Energy transferred to 2nd stage (aerobic stage)ATP
1
4
and
Glycolysis: Anaerobic process in cytoplasm that splits glucoseinto two 3C moleculesMakes 2 ATP
3. Kreb’s CycleTakes place in: matrix of mitochondria; produces 2 ATP
2. 2 Pyruvates
7. 6 H2O produced and a large amount of ATP (32)
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Glycolysis AnaerobicTakes place in cytoplasm (eukaryotes and
prokaryotes do this step since all cells have cytoplasm)
Splits one glucose molecule into two pyruvate molecules
2 ATPs are gained
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Kreb’s Cycle (Citric Acid Cycle)
AerobicTakes place in matrix of mitochondria (only
in eukaryotes)2 pyruvate (made during glycolysis) enter the
mitochondrion2 ATPs are made
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Electron Transport Chain (ETC)
AerobicTakes place in inner membrane of mitochondria
(cristae)Oxygen is taken in and combines with hydrogens to
release water32 ATP are made
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ATP from Cellular Respiration
4 from Glycolysis (uses up 2, so really only gain 2 ATP)
2 ATP from Kreb’s cycle32 ATP from ETCGAIN 36 ATP from one glucose molecule
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Equation for Cellular Respiration
C6H12O6 + 6O2 6CO2 + 6H2O + 36ATP
Like the reverse of photosynthesis
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What happens when there’s no/not enough oxygen or
there are no mitochondria?Answer: Fermentation
Two Kinds:Lactic Acid FermentationAlcoholic Fermentation