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Respiration Index

Powerpoint Presentation: Anaerobic Respiration

Introduction : Energy in Food
Glycolysis
Kreb's Cycle
The Electron Transport Chain
Photosynthesis and Respiration
The Respiratory Quotient and Respirometers

Topic Chapters Index

 

 

RESPIRATION

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Anaerobic Respiration

Obligate anaerobes: Primitive bacteria (eg Clostridium) for them O2 is poisonous.

Facultative anaerobes: Yeasts (also muscle tissue) can withstand a lack of oxygen for short periods. Can also respire aerobically.

Anaerobic respiration is less efficient. The electron transport chain needs free oxygen to function. Only a few molecules of ATP are produced by reactions directly coupled to the oxidation of glucose in glycolysis.

 

Net ATP gain per molecule of glucose = 2ATP

 

But what is to be done with all the spare electrons and protons?

These are used to reduce:

Pyruvate Arrow right Lactate (lactic acid)

or Pyruvate (via ethanal) Arrow right Ethanol + CO2

 

Facultative anaerobes must control themselves:

Much more ATP is produced in the presence of O2 (18 times more)

So:

O2 present: respiration is slow (negative feedback control)

 

O2 absent: respiration is fast

ATP and Citrate (formed in the Kreb's Cycle) inhibit the enzyme that phosphorylates glucose (phosphofructokinase) at the beginning of glycolysis. This is known as the Pasteur effect, a good example of allosteric inhibition.

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