cellular respiration: harvesting chemical energy
DESCRIPTION
Cellular Respiration: Harvesting Chemical Energy. Respiration is the process of extracting stored energy from glucose to make ATP. Cellular Respiration Equation. C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O and energy - PowerPoint PPT PresentationTRANSCRIPT
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Cellular Respiration: Harvesting Chemical Energy
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Respiration is the process of extracting stored energy from
glucose to make ATP.
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Cellular Respiration Equation
C6H12O6 + 6 O2 6 CO2 + 6 H2O and energy
As a result of respiration, energy is released from the chemical
bonds found in complex organic molecules (food).
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Aerobic Respiration
Aerobic Respiration is respiration which takes place
in the presence of oxygen
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Respiration is controlled by Enzymes
…rate is controlled by enzymes
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Cell Respiration is divided into 3 stages.
(components)
1. Glycolysis
2. Krebs Cycle
3. Oxidative Phosphorylation
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Glycolysis
Glyco- glucose, -lysis: to split Universal step in all forms of
respiration Likely used to supply energy for
the ancient cells.
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Glycolysis
Function - To split glucose and produce NADH, ATP and Pyruvate (pyruvic acid).
Location - Cytoplasm. Occurs in 9 steps…. 6 of the
steps use magnesium Mg as cofactors.
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NAD+
Energy carrier Nicotinamide Adenine
Dinucleotide
NAD+ + 2 e- NADH
NAD+ = oxidized form
NADH = reduced form
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Requirements for Glycolysis
Glucose 2 ATP…. As activation energy 4 ADP 2 NAD+
Enzymes
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The Products of Glycolysis
2 Pyruvic Acids (a 3C acid) 4 ATP 2 NADH
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Net Energy Result
2 ATP per glucose 2 NADH
In summary, glycolysis takes one glucose and turns it into 2
pyruvate, 2 NADH and a net of 2 ATP.
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Krebs CycleAlso called: Citric Acid Cycleor Tricarboxylic Acid Cycle
Function: Oxidize pyruvic acid to CO2
Produce: 3NADH, 1FADH2 and 1ATP
Location: Mitochondria matrix
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Formation of Acetyl CoA:Acetyl CoA is formed when the pyruvate , from
glycolysis, combines with Coenzyme A… tis takes place in the matrix.
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Requirements for Krebs Cycle
Pyruvic acid (3C acid) Coenzyme A 3 NAD+
1 ADP 1 FAD
Double this list for each glucose.
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Products of Krebs Cycle
3 CO2
Acetyl CoA 3 NADH 1 ATP 1 FADH2
Double this list for each glucose.
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Krebs Cycle
Produces most of the cell's energy in the form of NADH and
FADH2… not ATP Does NOT require O2
The CO2 produced by the Krebs cycle is the CO2 animal exhale
when they breathe.
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Oxidative Phosphorylation
Process of extracting to energy from NADH and FADH2 to form
ATP. Function: Convert NADH and
FADH2 into ATP. Location: Mitochondria cristae.
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Oxidative Phosphorylation
NADH or FADH2
ADP O2
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Oxidative Phosphorylation
Requires the Electron Transport Chain… the Electron Transport
Chain is a collection of proteins, embedded in the inner
membrane, used to transport the electrons from NADH and FADH2
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Cytochrome c
Cytochrome c: is one of the proteins of the electron transport chain…
often used by geneticists to determine relatedness… exists in all
living organisms. The Cytochromes alternate between
RED and OX forms and pass electrons down to O2
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ATP Yield
Each NADH energizes 3 ATP Each FADH2 energizes 2 ATP
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Chemiosmotic Hypothesis
ETC energy is used to move H+ (protons) across the cristae membrane.
ATP is generated as the H+
diffuse back into the matrix through ATP Synthase
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ATP Synthase
Uses the flow of H+ to make ATP.
Works like an ion pump in reverse, or like a waterwheel under the flow of H+ “water”.
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Alcoholic Fermentation
Carried out by yeast, a kind of fungus.
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Alcoholic Fermentation Uses only Glycolysis. An incomplete oxidation -
energy is still left in the products (alcohol).
Does NOT require O2
Produces ATP when O2 is not available.
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Lactic Acid Fermentation
Uses only Glycolysis. An incomplete oxidation -
energy is still left in the products (lactic acid).
Does NOT require O2
Produces ATP when O2 is not available.
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Lactic Acid Fermentation
Done by human muscle cells under oxygen debt.
Lactic Acid is a toxin and causes soreness and stiffness in muscles.
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Fermentation - Summary
Way of using up NADH so Glycolysis can still run.
Provides ATP to a cell even when O2 is absent.
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Aerobic vs Anaerobic
Aerobic - Respiration with O2
Anaerobic - Respiration without O2
Aerobic - All three Respiration steps. Anaerobic - Glycolysis only.
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Strict vs. Facultative Respiration
Strict - can only carry out Respiration one way… aerobic or anaerobic.
Facultative - can switch respiration types depending on O2 availability. Ex - yeast
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ATP yields by Respiration type
Anaerobic - Glycolysis only Gets 2 ATPs per glucose.
Aerobic - Glycolysis, Krebs, and Oxidative Phosphorylation (electron transport chain)
Generates many more ATPs per glucose.
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Aerobic ATP yield
Glycolysis - 2 ATPS, 2 NADHs Krebs - 2 ATPS, 8 NADHs,
2 FADH2
Each NADH = 3 ATP Each FADH2 = 2 ATP
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ATP Sum
10 NADH x 3 = 30 ATPs 2 FADH2 x 2 = 4 ATPs 2 ATPs (Gly) = 2 ATPs 2 ATPs (Krebs) = 2 ATPs
Max = 38 ATPs per glucose
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However...
Some energy is used in shuttling the NADH from
Glycolysis into the mitochondria.
Actual ATP yield ~ 36/glucose
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Yeast
Would rather do aerobic Respiration; it has 18x more
energy per glucose. But, anaerobic will keep you
alive if oxygen is not present.
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Importance of Respiration
Alcohol Industry - almost every society has a
fermented beverage. Baking Industry - many
breads use yeast to provide bubbles to raise the dough.
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MatchingSugar Cane Gin
Barley Saki
Grapes Tequila
Juniper Cones Vodka
Agave Leaves Beer
Rice Wine
Potatoes Rum
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Question
Why is the alcohol content of wine always around 12-14%?
Alcohol is toxic and kills the yeast at high concentrations.
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Swiss Cheese
Holes are bubbles of CO2 from fermentation.
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Summary
Know the 3 main reactions of Respiration and the 4
required items for each.
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Exergonic/Endergonic
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Biological Examples
Exergonic - respiration Endergonic - photosynthesis
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Cell - Types of Work
Mechanical - muscle contractions
Transport - pumping across membranes
Chemical - making polymers
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Cells use ATP as their energy source
Adenosine Triphosphate Made of:
- Adenine (nitrogenous base)
- Ribose (pentose sugar)
- 3 phosphate groups
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Adenine
Ribose
Phosphates
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Key to ATP
Is in the high energy bonds between the three phosphate
groups. Negative charges on the
phosphate groups repel each other and makes the phosphates unstable.
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ATP Cycles
Energy released from ATP drives anabolic reactions.
Energy from catabolic reactions “recharges” ATP.
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ATP CycleATP ADP + P + Energy
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ATP in Cells
A cell's ATP content is recycled every minute.
Humans use close to their body weight in ATP daily.
No ATP production equals quick death.