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Powerpoint Presentation: Respiration and the Kreb's Cycle

Respiration Index

Introduction : Energy in Food
Glycolysis
The Electron Transport Chain
Anaerobic Respiration
Photosynthesis and Respiration
The Respiratory Quotient and Respirometers

Topic Chapters Index

 

Total ATP from 1 molecule of glucose in aerobic conditions

 

 

ATP

Glycolysis

used in phosphorylation

- 2

 

gained by oxidation

+ 8

Kreb's Cycle

gained by oxidation

+ 30

TOTAL

 

+ 36

 

 

RESPIRATION

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Kreb's Cycle

Enzymes located in the inner matrix of mitochondria (in eukaryotes)

Note: Number of mitochondria per cell = activity of the cell. On average 1000 per cell (between 20 and 10 000)

 

Step 1: Synthesising ACETYL COENZYME A:

Synthesising ACETYL COENZYME A

 

Step 2: Oxidising Acetyl CoA:

Oxidising Acetyl CoA

 

The Kreb's Cycle was discovered by using inhibitors (e.g. malonate) and isolating enzymes from tissues rich in mitochondria (e.g. bird flight muscle).

 

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