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Ch' 6: How Cells Harvest Chemical Energy

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Aerobic Cellular Respiration. Organic molecules O2. CO2 H2O Energy. Redox Reactions ... Aerobic Cellular Respiration. 1. Glycolysis. 2. Kreb Cycle. 3. ... – PowerPoint PPT presentation

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Title: Ch' 6: How Cells Harvest Chemical Energy


1
Ch. 6 How Cells Harvest Chemical Energy
  • ATP

2
Energy Flow
  • Photosynthesis
  • O2 glucose
  • Cellular Respiration

CO2 H2O
ATP
Heat
3
Recycling
  • The chemical elements essential to life are
    recycled.
  • Energy is NOT recycled
  • Harvesting of chemical energy
  • complex
  • organic
  • molecules

Simpler waste products with less energy.
Catabolic pathway
ENERGY some used to do work, some dissipated as
heat
4
Two types of cellular respiration
  • 1. Aerobic respiration
  • final electron acceptor is O2
  • 2. Anaerobic respiration
  • final electron acceptor is not O2
  • fermentation

5
Aerobic Cellular Respiration
  • Organic molecules O2
  • CO2 H2O Energy

6
Redox Reactions
  • Always occur together
  • Involves the removal of electrons from one
    molecule (oxidation), and the transfer of these
    electrons to some other molecule (reduction)
  • In cells, the electron often belongs to a
    Hydrogen atom.

7
Generation of ATP
  • Decarboxylation
  • decarboxylases
  • Dehydrogenation
  • dehydrogenases
  • Function of NAD, FAD

8
Aerobic Cellular Respiration
  • 1. Glycolysis
  • 2. Kreb Cycle
  • 3. Electron Transport Chain

So, what do I have to know about each of
these metabolic pathways?
9
  • So, what do I have toknow about each of
    thesemetabolic pathways?

1. Initial reactants and final products 2.
Location of each pathway 3. How much ATP is
produced 4. Purpose of each metabolic pathway 5.
Decarboxylation, Dehydrogenation 6. Aerobic or
Anaerobic 7. Final electron acceptor
10
Anaerobic Respiration
  • E.g. fermentation
  • Alcoholic fermentation
  • Acidic fermentation
  • glycolysis fermentation

11
Why ask why?
  • So, why would an organism undergo fermentation
    when it can make so much more ATP from aerobic
    respiration?
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