respiration in living organisms

Why do living organisms need to respire?

  • We need energy to drive our biological processes.
  • All the reactions that take place within organisms are collectively known as metabolism.
  • Building large molecules = anabolic
  • Breaking down molecules= catabolic.

Metabolic processes include

  • Active transport
  • Secretion
  • Endocytosis
  • Sythesis of molecules (eg. amino acids to proteins)
  • Replication of DNA
  • Activation of chemicals


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Structure and Function of ATP

  • ATP provides the immediate source of energy for biological processes
  • ATP is a phosphorylated nucleotide.
  • Each molecule consists of adenosine (adenine and ribose sugar) plus three phosphate (phosphoryl) groups.
  • It can be hydrolysed to ADP and Pi releasing 30.6kj energy per mol, so energy is immediately available in small manageable amounts.
  • ATP is described as the universal energy currency.
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The Four Stages of Respiration

  • Glycolysis
  • Link Reaction
  • Krebs Cycle
  • Oxidative Phosphorylation
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Products of Glycolysis

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Structure and Function of the Mitochondria

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Structure and Function of the Mitochondria

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Link Reaction

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Krebs Cycle

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Products of the Link Reaction and Krebs Cycle

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Oxidative Phosphorylation

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Experimental evidence for Chemiosmosis

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Anaerobic Respiration

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Respiratory Substrates

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Please finish it off, the photosynthesis was amazing

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