AGENDA NOV 10 Learning Objective: Describe the process in which a cell uses glucose to produce energy. 1. Chapter 8 TESTS ◦ Grades are posted in Genesis ◦ Test Format 2. Begin Chapter 9 3. Looking Ahead to Trimester 1 Exam ◦ CHAPTER 9 TEST on MONDAY NOV 17
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AGENDA NOV 10 Learning Objective: Describe the process in which a cell uses glucose to produce energy. 1. Chapter 8 TESTS ◦Grades are posted in Genesis.
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AGENDA NOV 10
Learning Objective: Describe the process in which a cell uses glucose to produce energy.
1. Chapter 8 TESTS◦Grades are posted in Genesis◦Test Format
2. Begin Chapter 93. Looking Ahead to Trimester 1 Exam
◦CHAPTER 9 TEST on MONDAY NOV 17
CELLULAR RESPIRATION
CHAPTER 9
9-1: Chemical PathwaysWhy do we break down glucose for energy?Glucose stores a lot of energy.
Let’s Review….. What is ATP?
3811 calories of heat energy are produced per gram of glucose burned.
1 CALORIE = amount of energy needed to raise the temperature of 1 gram of water by 1 degree C.
Chemical energy and FoodHow is energy
measured in food?
Food labels display the number of Calories.
These Calories (CAPITAL C) are actually kilocalories.
What is Glycolysis?Glycolysis - a series of enzyme catalyzed
chemical reactions that change glucose into different molecules
One molecule of glucose is broken in half producing two molecules of pyruvic acid
Pyruvic Acid is a 3-C compound
Releasing Energy in FoodWhat does Glycolysis mean?
“sugar breaking”Glyco = Sugar Lysis = Breaking down
occurs in the cytoplasm and does not need oxygen
Only releases a small amount of energy.
How do cells produce the large amounts of energy we require for our everyday functions?
How do cells produce energy?
GLYCOLYSIS +KREBS CYCLE +ELECTRON TRANSPORT CHAIN =
CELLULAR RESPIRATION
What do we need?
The Equation?
GLYCOLYSIS
one molecule of glucose broken in half produces two molecules of pyruvic acid (PA)◦ How many Carbons are in Glucose?◦ How many Carbons are in one pyruvic acid?
Why does the cell spend energy to begin glycolysis?
To split the Glucose molecule.
Spends 2 ATP Makes a TOTAL of 4 ATP GAIN of 2 ATP
Glycolysis and NADH Production
NAD+ is the electron carrier.◦Nicotinamide Adenine Dinucleotide
What is the role of NAD+?
HEe- are removed and passed to NAD+2 NAD+ 2 NADH4 ATP made2 PA produced
How much energy is being made?
HOMEWORK NOV 10
On a blank sheet of paper…
Draw, Color, and Label◦FIGURE 9-2◦FIGURE 9-3
◦Diagrams must be colored or you will not receive full credit!
DO NOW Nov 11
SUMMARIZE the process of glycolysis.
Do this in one or two sentences.
ANSWER
A cell splits a molecule of glucose using 2 ATP to produce 4 ATP, 2 NADH, and 2 pyruvic acid.
In the cytoplasm
AGENDA NOV 11
Learning Objective: Investigate the two pathways available to pyruvic acid produced in glycolysis.
1. DO NOW2. Complete 9-13. HOMEWORK CHECK4. QUIZ TOMORROW
◦Glycolysis and Fermentation
Energy and Pyruvic AcidWhat is the role of NAD+ in the cell?
NAD+ is required to continue Glycolysis.Limited in the cellQuickly fill up with HEe-
What are the reactants required for cellular respiration?
How does the cell continue making energy if oxygen is unavailable?
FERMENTATIONFERMENTATION releases energy from food
molecules in an anaerobic environment.What does anaerobic mean?
Function of Fermentation?Converts NADH back to NAD+How does it do this?Passes electrons back to Pyruvic Acid
TWO TYPESAlcoholic and Lactic Acid
FERMENTATION
ALCOHOLIC LACTIC ACID
Yeast and microorganisms
PA + NADH Ethyl Alcohol + CO2 + NAD+
Why does bread dough rise?
Performed in most cells
PA + NADH Lactic Acid + NAD+
Why do your muscles burn when engaging in strenuous activity?
EXIT PASS
1. What are the advantages of GLYCOLYSIS?
2. What are the disadvantages of GLYCOLYSIS?
3. What is the function of Fermentation?
4. Which products are produced by alcoholic fermentation?
EXIT PASS ANSWERS
1. Breaks down glucose in an anaerobic environment. Makes energy.
2. Only makes a small amount of energy for the cell (GAIN of 2 ATP)◦Not enough for cells to survive
3. Converts NADH back to NAD+◦Passes e- back to PA
4. Lactic Acid fermentation
Question of the DAY NOV 12
What are the reactants of fermentation?
A. ADP and NADHB. Glucose and NADHC. Pyruvic Acid and Carbon DioxideD. Pyruvic Acid and NADH
AGENDA NOV 12
Learning Objective: Discuss the role of electron carriers and pyruvic acid in the Krebs Cycle.
1. QUIZ2. KREBS Cycle3. Homework Questions – On last slide4. Review – TEST on Monday Nov 17
◦Use your diagrams!
9-2: The Krebs Cycle and ETC
90% of energy in Pyruvic Acid still unused
Locked in the HE electrons
Discovered by Hans Krebs
PA from glycolysis enters mitochondria
KREBS CYCLE occurs here
The Krebs Cycle
Pyruvic Acid is broken down into carbon dioxide in a series of energy-extracting reactions.
2nd stage of cellular respiration.
Called the Citric Acid Cycle.
Citric Acid is first compound formed.
The Krebs Cycle: STEP A
1. PA from Glycolysis enters mitochondria
2. One C from PA becomes part of CO2
3. Remaining 2 C Acetyl Coenzyme A (CoA)
4. Acetyl CoA + 4 C molecule = Citric Acid
The KREBS CYCLE: STEP B
1. Citric Acid (6-C) broken down ◦CO2 released
2. Electrons transferred to e- carriers.◦NAD+ NADH FAD FADH2
KREBS CYCLE produces (2 Turns)8 NADH, 2 FADH2, and 2 ATP
ETC produces32 ATP
TOTAL ATP in 1 GLUCOSECellular Respiration produces 36 ATP for use by the
cell.
38 ATP – 2 ATP SPENT = 36 ATP
This is 38% of the energy available in Glucose.
Where does the rest of the energy go?It is lost as heat.This is why we feel hot after strenuous activity.
ENERGY and EXERCISE
Short Term Energy◦Small amounts of ATP in muscles◦Lactic Acid Fermentation takes over◦Enough energy to last approximately 90
secondsLong Term Energy
◦Cellular respiration is needed◦Releases energy slower than fermentation◦Stored in the carbohydrate Glycogen◦15 – 20 minutes of energy (then breaks down
fats and other molecules)◦Even the most conditioned athletes must pace