cellular respiration let’s review
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Cellular Respiration Let’s Review. Is a chemical process that uses oxygen to convert chemical energy stored in organic molecules into another form of chemical energy – a molecule called ATP Cells in plants and animals then use the ATP as their main energy supply. Energy. - PowerPoint PPT PresentationTRANSCRIPT
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Cellular Respiration Let’s Review Is a chemical process that uses
oxygen to convert chemical energy stored in organic molecules into another form of chemical energy – a molecule called ATP
Cells in plants and animals then use the ATP as their main energy supply.
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Energy
The ability to perform work Ex: your heart muscle does work
every time it beats Two basic forms of energy
Potentialkinetic
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Potential Energy
Is stored energy due to an object’s position or arrangement
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Kinetic Energy
Energy of motion Anything that is moving Kinetic - “motion”
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Thermal Energy
Energy that has been transferred
From areas that are warmer to cooler
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Chemical Energy
Organic compounds store energy (potential) in the way their atoms are arranged.
This is called chemical energy
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ATP - Nature's Energy Store
All living things, plants and animals, require a continual supply of energy in order to function.
The energy is used for all the processes which keep the organism alive.
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Before the energy can be used, it is first transformed into a form which the organism can handle easily.
This special carrier of energy is the molecule adenosine triphosphate, or ATP.
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Its Structure
The ATP molecule is composed of three components.
At the center is a sugar molecule, ribose (the same sugar that forms the
basis of RNA).
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Attached to one side of this is a base (a group consisting of linked rings of carbon and nitrogen atoms); in this case the base is adenine.
The other side of the sugar is attached to a string of phosphate groups.
These phosphates are the key to the activity of ATP.
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ATP consists of a base, in this case adenine (red), a ribose (magenta) and a phosphate chain (blue).
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How it works
ATP works by losing the endmost phosphate group when instructed to do so by an enzyme.
This reaction releases a lot of energy, which the organism can then use to build proteins, contact muscles, etc
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The reaction product is adenosine diphosphate (ADP),
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Even more energy can be extracted by removing a second phosphate group to produce adenosine monophosphate (AMP).
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When the organism is resting and
energy is not immediately needed, the reverse reaction takes place and the phosphate group is reattached to the molecule using energy obtained from food or sunlight.
he ATP molecule acts as a chemical 'battery', storing energy when it is not needed, but able to release it instantly when the organism requires it.
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The Phosphorus Cycle The fact that ATP is Nature's
'universal energy store' explains why phosphates are a vital ingredient in the diets of all living things. Modern fertilizers often contain phosphorus compounds that have been extracted from animal bones.
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These compounds are used by plants to make ATP. We then eat the plants, metabolise their phosphorus, and produce our own ATP. When we die, our phosphorus goes back into the ecosystem to begin the cycle again...
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Cellular Respiration
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Cellular Respiration A catabolic, exergonic, oxygen (O2)
requiring process that uses energy extracted from macromolecules (glucose) to produce energy (ATP) and water (H2O).
C6H12O6 + 6O2 6CO2 + 6H2O + energy
glucose ATP
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Question:
In what kinds organisms does cellular respiration take place?
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Plants and AnimalsPlants - Autotrophs: self-
producers.Animals - Heterotrophs:
consumers.
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Mitochondria Organelle where cellular respiration takes place.
Innermembrane
Outermembrane
Innermembrane space
Matrix Cristae
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Breakdown of Cellular Respiration
Three main parts (reactions).
1. Glycolysis (splitting of sugar)a. cytosol, just outside of
mitochondria.
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Breakdown of Cellular Respiration2. Krebs Cycle (Citric Acid Cycle)
a. mitochondrial matrix
3. Electron Transport Chain (ETC a.. inner mitochondrial membrane.
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1. Glycolysis
Occurs in the cytosol just outside of mitochondria.
Two phases:A. Energy investment phase
a. Preparatory phase
B. Energy yielding phasea. Energy payoff phase
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1. Glycolysis
A. Energy Investment Phase:
Glucose (6C)
Glyceraldehyde phosphate (2 - 3C) (G3P or GAP)
2 ATP - used0 ATP - produced0 NADH - produced
2ATP
2ADP + P
C-C-C-C-C-C
C-C-C C-C-C
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1. Glycolysis
B. Energy Yielding Phase
Glyceraldehyde phosphate (2 - 3C) (G3P or GAP)
Pyruvate (2 - 3C) (PYR)
0 ATP - used4 ATP - produced2 NADH - produced
4ATP
4ADP + P
C-C-C C-C-C
C-C-C C-C-C
GAP GAP
(PYR) (PYR)
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1. Glycolysis
Total Net Yield
2 - 3C-Pyruvate (PYR)2 - ATP 2 - NADH
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2. Krebs Cycle (Citric Acid Cycle) Location: mitochondrial matrix.
Acetyl CoA (2C) bonds to Oxalacetic acid (4C - OAA) to make Citrate (6C).
It takes 2 turns of the krebs cycle to oxidize 1 glucose molecule.
MitochondrialMatrix
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2. Krebs Cycle (Citric Acid Cycle)
KrebsCycle
1 Acetyl CoA (2C)
3 NAD+
3 NADHFAD
FADH2
ATP ADP + P
(one turn)
OAA (4C) Citrate (6C)
2 CO2
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2. Krebs Cycle (Citric Acid Cycle)
KrebsCycle
2 Acetyl CoA (2C)
6 NAD+
6 NADH2 FAD
2 FADH2
2 ATP 2 ADP + P
(two turns)
OAA (4C)Citrate (6C)
4 CO2
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2. Krebs Cycle (Citric Acid Cycle) Total net yield (2 turns of krebs cycle)
1. 2 - ATP (substrate-level phosphorylation)2. 6 - NADH3. 2 - FADH2
4. 4 - CO2
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3. Electron Transport Chain (ETC) and Oxidative Phosphorylation (Chemiosmosis)
Location: inner mitochondrial membrane. Uses ETC and ATP Synthase (enzyme) to make
ATP.
ETC pumps H+ (protons) across innermembrane (lowers pH in innermembrane space).
InnerMitochondrialMembrane
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3. Electron Transport Chain (ETC) and Oxidative Phosphorylation (Chemiosmosis) The H+ then moves via diffusion through ATP
Synthase to make ATP.
All NADH and FADH2 converted to ATP during this stage of cellular respiration.
Each NADH converts to 3 ATP.
Each FADH2 converts to 2 ATP (enters the ETC at a lower level than NADH).
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TOTAL ATP YIELD
1. 04 ATP – glycolysis and krebs cycle2. 34 ATP - ETC 38 ATP - TOTAL YIELD
ATP
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Maximum ATP Yield for Cellular Respiration (Eukaryotes)
36 ATP (maximum per glucose)
Glucose
Glycolysis
2ATP 4ATP 6ATP 18ATP 4ATP 2ATP
2 ATP(substrate-levelphosphorylation)
2NADH
2NADH6NADH
KrebsCycle
2FADH2
2 ATP(substrate-levelphosphorylation)
2 Pyruvate2 Acetyl CoA
ETC and Oxidative Phosphorylation
Cytosol
Mitochondria
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Fermentation
Occurs in cytosol when “NO Oxygen” is present (called anaerobic).
Remember: glycolysis is part of fermentation. Two Types:
1. Alcohol Fermentation
2. Lactic Acid Fermentation
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Alcohol Fermentation
Plants and Fungi beer and wine
glucose
Glycolysis
CCCCCC
CCC
2 Pyruvic acid
2ATP2ADP+ 2
2NADH
P
2 NAD+
CC
2 Ethanol2CO2
released
2NADH 2 NAD+
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Lactic Acid Fermentation
Animals (pain in muscle after a workout).
2 Lactic acid
2NADH 2 NAD+
CCC
Glucose
GlycolysisCCC
2 Pyruvic acid
2ATP2ADP+ 2
2NADH
P
2 NAD+
CCCCCC
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Lactic Acid Fermentation
End Products: Lactic acid fermentation
2 - ATP 2 - Lactic Acid molecules
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Alcohol Fermentation
End Products: Alcohol fermentation
2 - ATP
2 - CO2
2 – molecules of ethanol
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Question:
In addition to glucose, what other various food molecules are use in Cellular Respiration?
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Catabolism of VariousFood Molecules Other organic molecules used for fuel.
1. Carbohydrates: polysaccharides
2. Fats: glycerol’s and fatty acids
3. Proteins: amino acids