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Zusammenfassung Abitur Lernzettel - Biologie und Englisch $8.32   Add to cart

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Zusammenfassung Abitur Lernzettel - Biologie und Englisch

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Hier findest du ausführliche Zusammenfassungen für die Fächer Biologie und Englisch

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  • June 2, 2024
  • 4
  • 2023/2024
  • Summary
  • Secondary school
  • Gymnasium
  • 100
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BIOMEMBRAN Aufbau und Funktion einer Biomembran


Funktion und Merkmale
•Kompartimentierung: -> räumliche Trennung zu benachbarten Zellen
-> Bildung eines geschlossenen Raums zur Stoffspeicherung oder als Reaktionsraum
• umgibt Zellorganelle, wie Mitochondrien, Chloroplasten und Lysosome
•Stofftransport mit Hilfe von Proteinen
•Kohlenhydrate erkennen Fremdkörper -> Schlüssel-Schloss-Prinzip
•elastisch & widerstandsfähig -> ständiger Auf- und Umbau der Biomembran


Kohlenhydrat Glykoprotein
Glykolipid




·
&

·


f ·,
.D
Lipiddoppelschicht
·
· ·
S
B
ie
-/ Cholesterin
peripheres Protein integrales Protein



Grundbestandteile:




·
Membranlipid Lipiddoppelschicht


·
hydrophiler Kopf Schranke für Wasser und
hydrophobe Moleküle Membranproteine: •unregelmäßige Anordnung
hydrophober Schwanz
•ermöglichen selektiven Stoffaustausch
e Y
·
integrales Membranprotein peripheres Membranprotein
Kohlenhydrate: •fast ausschließlich an Zelloberfläche

4 4 ↳ ·
•durchdringt die BM •liegt auf der Lipidschicht
Glykolipid Glykoprotein

..... ·


•gebunden an Lipide •gebunden an Proteine

· Cholesterin:
•erhöht Fluidität bei festen Membranen
•vorhanden -> 50% bei tierischen Membranen


4
-> weniger bei pflanzlichen Membranen
-> keins bei Bakterien
•starres Ringsystem behindert Fluss der Lipidschicht -> macht diese starrer




·

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