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  7. Unit 5 - Energy transfers in and between organisms

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Respiration
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Respiration notes for AQA A level Biology. These are hand written notes from a year 13 student and not simply copied from the textbook. They contain necessary information and not excessive, just enough to smash the exams.

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  • June 1, 2021
  • 4
  • 2020/2021
  • Lecture notes
  • Mr pullen
  • All classes

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Section 5 ( Energy Transfer in between Organisms ), Topics 12

Respiration is the process of cells acquiring ATP energy molecules through organic
compounds such as Glucose. Alongside Oxygen, glucose can be dissociated for cells to use
the immediate energy source that is ATP, through cellular respiration.

 Aerobic Respiration
o Requires oxygen and glucose, and produces carbon dioxide, water and ATP
energy.
 Anaerobic Respiration
o Used by cells during oxygen deficit. Produces lactic acid as a harmful
biproduct of the partial dissociation of glucose, and produces a small amount
of ATP.



Anaerobic Respiration Aerobic Respiration

Reactants Glucose Glucose and Oxygen

Combustion Incomplete Dissociation of Glucose Complete Dissociation of Glucose

Energy Low ( 2 ATP molecules per High ( 36 ATP molecules per
Yield Glucose ) Glucose )

Animals : Lactic Acid
Products Yeasts : Ethanol and Carbon Carbon Dioxide and Water
Dioxide

Location Cytoplasm Mitochondria and Cytoplasm

Glycolysis
Glycolysis Link Reaction
Stages
Fermentation Krebs Cycle
Oxidative Phosphorylation




Aerobic Respiration
Aerobic Respiration is the cellular respiration used for the majority of time, using oxygen
and glucose to dissociate glucose and produce carbon dioxide, water and ATP energy. This is
the baseline of metabolic reactions happening in cells, and is the main reason why
organisms can have internal synthesis of ATP.

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