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Summary Aerobic Respiration
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Revision notes on aerobic respiration. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Flowchart/diagrams.

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  • December 4, 2023
  • 5
  • 2022/2023
  • Summary

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Aerobic Respiration:


GLYCOLYSIS (OCCURS IN CYTOPLASM):
GLUCOSE
(6 Carbon Compound)
Two phosphate groups added
by the hydrolysis of 2 ATP
molecules to ADP.
HEXOSE BISPHOSPHATE (ATP  ADP +P)
(6 Carbon Compound with
2 phosphate groups).




TRIOSE PHOSPHATE TRIOSE PHOSPHATE

(3 Carbon Compound with (3 Carbon Compound with
1 phosphate group). 1 phosphate group).


2H is removed from each molecule by a
dehydrogenase enzyme. A NAD molecule
converted to a reduced NAD molecule. The
phosphate groups are removed & 2 ATP
molecules are generated from ADP & P. This
is Substrate Level Phosphorylation.

PYRUVATE ADP + P  ATP
PYRUVATE
(3 Carbon Compound). NAD + H 
(3 Carbon Compound).
Reduced NAD

Net Products:
2 Pyruvate Molecules
2 Reduced NAD
2 ATP

, THE LINK REACTION (OCCURS IN MITOCHONDRIAL MATRIX):

PYRUVATE PYRUVATE
(3 Carbon Compound). (3 Carbon Compound).

CO2 produced from the carbon removed by
pyruvate decarboxylase.
2H removed by pyruvate dehydrogenase. 2
NAD molecules converted to 2 reduced
NAD.
NAD + H  Reduced NAD

ACETATE ACETATE
(2 Carbon Compound). (2 Carbon Compound).


Coenzyme A combines with acetate to
form acetyl coenzyme A.

ACETYL COENZYME A ACETYL COENZYME A
(2 Carbon Compound). (2 Carbon Compound).

Net Products:
2 CO2
2 Reduced NAD
2 Acetyl Coenzyme A
The Krebs Cycle (OCCURS IN THE MITOCHONDRIAL MATRIX):

ACETYL COENZYME A ACETYL COENZYME A
(2 Carbon Compound). (2 Carbon Compound).
Acetyl coenzyme A releases
acetate, Coenzyme A is
released to be used again.

ACETATE ACETATE
(2 Carbon Compound). (2 Carbon Compound).

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