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Cellular Respiration
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Warm Up!!!Where do you get energy from?
Would you consider these energy sources “fuel”?
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Food is Fuel• Energy is stored in bonds of the food we eat!
• Calories measure the amount of energy in food.1 Calorie = amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius.
What happens when we consume too many calories????
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How do we get energy from the foods we eat???
Cellular respiration is a process in which organisms use oxygen and glucose ( or other food molecules) to create ATP (energy).
What do you notice about this equation????
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Mitochondria- The Powerhouse of the Cell!!
• Inner membrane has many folds called cristae. More sites to make ATP. (Increased surface area)
• The matrix is the fluid within the inner membrane.
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Two types of Cellular Respiration
• Aerobic respiration uses oxygen to make energy (lots of ATP made)
• Anaerobic respiration does not use oxygen (very little ATP made)
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3 Main Stages of Cellular Respiration
If it all happened in 1 big reaction most of the energy would be released as light and heat!!!!
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Stage 1: Glycolysis
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Stage 1: Glycolysis• 1st stage of cellular respiration
• Occurs in the cytoplasm
• Molecules of glucose are broken in half making 2 molecules of pyruvic acid.
• Does not require oxygen!!!! (anaerobic)
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Stage 1: Glycolysis• The cell uses 2 ATP to get the reaction started• 4 ATP molecules are made• Net gain of 2 ATP molecules• 2 NAD+ accept 4 high energy electrons making 2 NADH
that goes on to power the rest of the steps of cellular respiration. Still lots of
energy to be extracted !!
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If oxygen is not present glycolysis is followed by………
• Fermentation – release of energy from food molecules by producing ATP in the absence of oxygen.
• 2 types of fermentation– Alcoholic fermentation – bread dough rises
– Lactic Acid fermentation – muscle burn
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Alcoholic Fermentation
Produces 2 molecules of ATP and CO2
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Lactic Acid Fermentation
Only produces 2 molecules of ATP!!!!!
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Stage 2: Citric Acid Cycle (Krebs Cycle)
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Stage 2: Citric Acid Cycle (Krebs Cycle)
• Requires oxygen – aerobic
• Occurs in the mitochondrion.
• CO2 released.
• ATP, NADH and FADH2
(similar molecule to NADPH) made to provide energy for the electron transport chain to generate a large amount of ATP.
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Citric Acid Cycle(Krebs Cycle)1. Pyruvic acid that was made in
glycolysis is broken down and converted to Acetyl CoA.
2. Acetyl CoA is further broken down into citric acid.
3. Citric acid is broken down into a 5-carbon compound and then broken into a 4-carbon compound that starts the cycle all over again.
2 molecules of Pyruvic acid yield the following molecules!!!
6 - molecules of CO2
8 – NADH2 – FADH22 – molecules of ATP
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Stage 3: Electron Transport
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The Electron Transport Chain uses all the high energy electrons from NADH and FADH2 to make large amounts of ATP via ATP synthase, an enzyme that turns ADP +P into ATP!!
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The Total Energy Tally
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Overview of Photosynthesis and Cellular Respiration
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How are the two processes, cellular respiration and breathing, connected in this diagram???
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Compare and Contrast
Photosynthesis Cellular Respiration
Function
Organelle
Reactants
Products
Equation
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Student Sex(M or F)
Resting Heart Rate (bpm)
Resting Carbon Dioxide
production (time)
Elevated Heart
Rate (bpm)
Elevated
Carbon Dioxide
production
(time)
Averages
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Summarizer
Because fermentation takes place in the absence of oxygen, it is said to be
A.Aerobic
B. Anaerobic
C. Cyclic
D. Makes oxygen
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Summarizer
During exercise, the buildup of lactic acid is primarily due to which of the following processes?
A.Glycolysis
B. Fermentation
C. Krebs Cycle
D. Electron Transport
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Summarizer
The Krebs Cycle and the Electron Transport Chain take place in the
A.Nucleus
B. Chloroplast
C. Cytoplasm
D. Mitochondria
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Summarizer
In cells, the energy available in food is used to make a compound high in energy called:
A.Water
B. Sugar
C. ATP
D. Fats
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Summarizer
Cellular respiration is the process by which:
A. Oxygen is used to transport energy across the body
B. Light energy is converted to kinetic energy
C. Energy from food is captured by an organism
D. ATP is converted to sugar and water
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Summarizer
Which of the following processes occur in a plant leaf?
A. Photosynthesis
B. Cellular Respiration
C. Both A and B
D. Neither A or B
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Copyright Pearson Prentice Hall
Summarizer
The Krebs cycle breaks pyruvic acid down into
a) oxygen.
b) NADH.
c) carbon dioxide.
d) alcohol.
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Copyright Pearson Prentice Hall
What role does the Krebs cycle play in the cell?a) It breaks down glucose and releases its stored
energy.
b) It releases energy from molecules formed during glycolysis.
c) It combines carbon dioxide and water into high-energy molecules.
d) It breaks down ATP and NADH, releasing stored energy.
Summarizer
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Copyright Pearson Prentice Hall
In eukaryotes, the electron transport chain is located in the
a) cell membrane.
b) inner mitochondrial membrane.
c) cytoplasm.
d) outer mitochondrial membrane.
Summarizer
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Copyright Pearson Prentice Hall
To generate energy over long periods, the body must use
a) stored ATP.
b) lactic acid fermentation.
c) cellular respiration.
d) glycolysis.
Summarizer
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Copyright Pearson Prentice Hall
Which statement correctly describes photosynthesis and cellular respiration?
a) Photosynthesis releases energy, while cellular respiration stores energy.
b) Photosynthesis and cellular respiration use the same raw materials.
c) Cellular respiration releases energy, while photosynthesis stores energy.
d) Cellular respiration and photosynthesis produce the same products.
Summarizer