Celula Procariota Flashcards

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1
Q

Carui regn apartine Celula procariota?

A

Monera

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2
Q

Ce fel de organisme sunt celulele procariote?

A

Organisme primitive,unicelulare

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3
Q

Explicati structura celulei procariote

A
  • perete celular rigid
  • membrana celulara
  • citoplasma
  • nucleoid
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4
Q

Ce putem spune despre membrana celulara a organismelor procariote?

A

Este de natura lipo-proteica si poate prezenta invaginari de tipul:
-mezozomilor- mb. pliata, sferica, contine enzime cu rol in respiratie

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5
Q

Caracterizati citoplasma celulei procariote

A

Vascoasa, stare coloidala de gel, contine proteine,glucide,lipide insa NU prezinta curenti plasmatici sau citoschelet proteic
-contine ribozomi!

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6
Q

Caracterizati ribozomii celulelor procariote

A

Contin ARN si oroteine
Lipsiti de membrana
20-3000/ celula
Rol in sinteza proteinelor!!!!

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7
Q

Caracterizati nucleoidul celulei procariote

A

Format dintr o singura macromolecula de ADN(cromozom circular)
Difuz in citoplasma
In contact direct si permanent cu citoplasma

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8
Q

Care sunt caracteristicile celulei procariote?

A

Sunt foarte raspandite deoarece au o capacitate adaptiva mare
Au un metabolism intens
Durata dintre generatii este foarte scurta (diviziune directa de cateva ori pe zi)

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9
Q

Importanta celulelor procariote

A

1) Importanta teoretica: in explicarea procesului de evolutie ‼️ celula eucariota provine dun celula procariota in urma unei simbioze repetste conform teoriei endosimbiotice
2) practica: majoritatea bacteriilor au rol de descompunatori in ecosistemele terestre si acvatice

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