Recovery process

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Recovery processes take different forms in living things . This reduces the consumption of materials and energy in the biosynthesis of biomolecules .

Examples

There are many examples of recovery processes in living things. Some of these take place via metabolic pathways and some via reabsorption . In the biosynthesis of nucleic acids , the salvage pathway to reuse purine nucleotides occurs. Over 90% of the purine nucleotides in the synthesis of nucleic acids originate from nucleic acid degradation reactions. Cyclic metabolic pathways like the citric acid cycle involve a recovery process so that metabolites are reused.

In C3 plants , photorespiration creates the toxic metabolic product 2-phosphoglycolate , which the plant has to eliminate. Photorespiration occurs as a result of a carbon dioxide deficiency. If there is a lack of carbon dioxide and a corresponding excess of oxygen in a leaf, the enzyme ribulose-1,5-bisphosphate carboxylase ( RuBisCO for short ) binds oxygen instead of carbon dioxide. By converting oxygen instead of carbon dioxide, the toxic product 2-phosphoglycogate is created. If this toxic substance is now in the chloroplasts of the plant, it takes countermeasures and breaks down this poison with the help of the peroxisomes . The main aim of the plant is to regain products that it used for photorespiration, as these were wasted by photorespiration.

Resorptive recovery processes include, for example, the reuptake of released neurotransmitters by neurons . Various salts , glucose and amino acids are reabsorbed from the primary urine into the bloodstream .

Individual evidence

  1. ^ Donald Voet, Judith G. Voet, Charlotte W. Pratt: Textbook of Biochemistry. ISBN 978-3-527-82121-1 , p. 992.
  2. ^ Georg Löffler: Functional Biochemistry. ISBN 978-3-662-07345-2 , p. 157.
  3. ^ Mark F. Bear, Barry W. Connors, Michael A. Paradiso: Neurosciences. ISBN 3662572621 p. 167.
  4. ^ Gertrud Rehner, Hannelore Daniel: Biochemistry of nutrition. ISBN 3827411572 p. 553.
  5. ^ Peter Karlson, Detlef Doenecke: Karlsons Biochemie und Pathobiochemie. 2005, ISBN 9783133578158 . P. 700.