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Krebs Cycle

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Cellular Respiration: A series of BIOCHEMICAL PATHWAYS the product of 1 reaction is the reactant of the next reaction Occurs in the mitochondria ( & cytoplasm) Is ... – PowerPoint PPT presentation

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Title: Krebs Cycle


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ETC occurs here
Krebs Cycle Occurs here
3
Cellular Respiration
  • A series of BIOCHEMICAL PATHWAYS the product of
    1 reaction is the reactant of the next reaction
  • Occurs in the mitochondria ( cytoplasm)
  • Is the process of creating ENERGYATP!!!!
  • food broken down into organic molecules,
    ultimately broken down into GLUCOSE
  • glucose changed into/converted into ATP (ENERGY)
  • enzyme controlled

4
CR
  • Occurs in BOTH PLANTS AND ANIMALS
  • Has 3 stages
  • Glycolysis anaerobic w/o Oxygen
  • Krebs Cycle (aka Citric acid cycle)
  • aerobic
    require oxygen
  • 3. Electron Transport Chain (ETC) -

  • aerobic

5
Glycolysis
  • Occurs in the cytoplasm (cytosol)
  • Chemical RXN where sugar- GLUCOSE is broken down
    into
  • 2 Pyruvic Acid molecules
  • Produces 2 ATP molecules for every 1 glucose
    molecule
  • NAD provides energy for the change (an e- energy
    carrier)

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Products from Glycolysis move into the
Mitochondria
  • THE PRODUCT (Pyruvic Acid) WILL
  • THEN BE USED AS THE REACTANT IN
  • THE NEXT REACTION
  • HenceBiochemical Pathway

8
CK ?? Topic CR Date
10-11-10
  1. What is the purpose of Cellular Respiration?
  2. Where are the 2 places does CR occurs?
  3. What are the 3 stages of CR?

9
CK ?? Topic CR Date
10-11-10
  1. How many usable ATP result from Glycolysis?
  2. What is the second stage of CR?
  3. Where does the second stage take place?
  4. What does the term aerobic mean?

10
Stage 2Krebs (Citric Acid Cycle)
  • Oxygen is required Aerobic Respiration
  • A series of chemical rxns a cycle
  • Pyruvic Acid is further broken down
  • into Acetyl CoA
  • CO2 is produced and
  • released into the air from animal cells
  • Or in plants move to the chloroplasts to be used
    for photosynthesis

11
Pyruvic Acid is further broken down
  • 2 ATP are produced and
  • NADH FADH are produced (high energy electron
    carriers) which will provide the energy to bond
    the last phosphate in ADP to create ATP!

ENERGY
12
Citric Acid Cycle
  • Takes place in
  • the matrix of
  • the mitochondria

13
In summary
Pyruvic Acid is further broken down into Acetyl
CoA as it enters the Krebs Cycle
14
Stage 3-Electron Transport Chain
15
Stage 3-Electron Transport Chain
  • Occurs in the inner Mitochondrial Membrane
  • Majority of the ATP (34 ATP) are produced during
    ETC
  • The high-energy electrons produced during the
    Krebs Cycle (NADH and FADH2) are used to convert
    ADP into ATP

16
Chemical Formula Cellular Respiration
  • Sugar Oxygen ? Energy Carbon Dioxide Water
  • C6H12O6 6O2 ?36 ATP 6CO2 6H2O

17
Glycolysis
  • Goal To break down sugar into 2 Pyruvic Acids
  • Who Both plant and animals
  • Where In the cytoplasm of the cell
  • Products 2ATP, 2NADH, 2 Pyruvic

18
Krebs cycle
  • Goal convert (change) the pyruvic acid into
    NADH and FADH2
  • Where mitochondria
  • Products Energy carriers NADH FADH2, CO2
    (released to environment) and 2 ATP

19
Electron Transport Chain(chemiosmosis? making
ATP!!)
  • Goal break down NADH and FADH2 to produce ATP
  • Where Mitochondria membrane
  • Products 32 -34 ATP

20
AS A RESULT OF AEROBIC CELLULAR RESPIRATION
  • 2 ATP FROM GLYCOLYSIS
  • 2 ATP FROM KREBS CYCLE
  • 32-34 ATP FROM THE ETC
  • TOTAL OF
  • 36-38 ATP FOR EVERY MOLECULE OF GLUCOSE

21
IF NO OXYGEN IS AVAILABLE
  • Anaerobic Respiration (FERMENTATION)
  • Begins with Glycolysis
  • DOES NOT REQUIRE OXYGEN
  • Also known as FERMENTATION

22
2 types of FERMENTATION
  1. Alcoholic fermentation
  2. Lactic acid fermentation

23
Lactic Acid Fermentation
  • Pyruvic acid converted (changed) into lactic acid
  • Used to make cheese, yogurt, and is the stuff
    that accumulates in muscles (sore)
  • 2 ATP only

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Alcoholic Fermentation
  • Used to make beer, wine
  • Yeast used in process
  • 2 ATP only

26
Reproduce Through BUDDING!!
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  • Clearly Not as efficient as aerobic respiration

28
  • Photosynthesis and cellular respiration are
    opposite rxns.

29
Photosynthesis CRare opposite rxns.
  • Photosynthesis
  • removes Carbon Dioxide from the atmosphere and
    puts back oxygen.
  • Cellular Respiration
  • Removes oxygen from the atmosphere and puts back
    carbon dioxide.

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