Docstoc

Powerpoint format

Document Sample
Powerpoint format Powered By Docstoc
					 What you should know
  from today’s lecture
• The importance of glycolysis,
  fermentation, and respiration
  (Krebs cycle) in biology
• The site of glycolysis,
  fermentation, and respiration in
  prokaryotes and eukaryotes
• Overall chemical reactions of
  glycolysis, fermentation, and
  respiration
• Mitochondrion structure
• Poisons affecting respiration
  The importance of
 glucose metabolism
• The most primitive and
  universal method for
  capturing and converting
  chemical energy
• Performed by all organisms,
  auto- and heterotrophs
• Fermentation pathways are
  ancient but inefficient
• Aerobic respiration is
  efficient but requires oxygen
  (from photosynthesis)
Energy release from glucose
                Glucose
                 (6 C)

                        Glycolysis

                                 2 ATP



   Lactate                         Alcoholic
                2 Pyruvate
fermentation                     fermentation
                   (3 C)

Lactate                              Ethanol
 (3 C)                                (2 C)
                           6O2          +
            Aerobic                    CO2
          respiration
                                 34-36 ATP
                  6 CO2
                    +
                  6 H 2O
   Glycolysis: overview




What is NAD+?



• All cells can perform
  glycolysis -- universal source
  of energy (ATP) and carbon
  skeleton
• Glycolysis takes place in the
  cytoplasm
Glycolysis I




               Fig. 8.4b, p.
                    135
Glycolysis II




                Fig. 8.4c, p.
                    135
Aerobic respiration: overview




  • Aerobic respiration takes
    place in the cytoplasm and
    membrane of prokaryotes,
    and in the mitochondria of
    eukaryotes
Aerobic respiration




                      Fig. 8.6, p.
                         137
(see next slide)




Mitochondrion


                   Fig. 8.5a, p.
                       136
Chemiosmotic ATP formation




                        Fig. 8.5b, p.
                             136
ATP yield from aerobic
     respiration
           Fermentation
Lactate fermentation

                         Lactate dehydrogenase
                         (LDH)




Site of lactate fermentation:
Examples of lactate fermentation:

Alcoholic fermentation




Site of alcoholic fermentation:
Examples of alcoholic fermentation:
Metabolic poisons
Metabolism




             Fig. 8.12, p.
                 143

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:1
posted:11/22/2013
language:Unknown
pages:14