Estás en: Inicio > Levels of organization
History of Biology
The origin of the life
Diversity of the living beings
Theory of evolution
Animal histology
Blod tissue  

Levels of organization


1. Alive beings acelulares
2. Cellular alive beings
Cells procariotas: bacteria, cianobacterias and micoplasmas.
Cells eucariotas: alive beings, animals and vegetables
Alive beings exist other organisms nonconsidered, these are the priones: pathogenic agents formed by proteins.


Size of 1 to 60 microns
Surrounded by invagina plasmática membrane that forming mesosomas (characteristic of bacteria). Over the membrane this the wall (nonexisting in micoplasmas).
Some procariotas can present/display flagella and all almost has ribosomas
The genetic material is forming the nucleoide and not this surrounded by the nuclear envelope.
Some as cianobacterias presents/displays photosynthetic metabolism.


Size of 10 to 100 microns.
The genetic material this located in the nucleus surrounded by the nuclear envelope.
They present/display cytoplasm inside which they are the cellular orgánulos each one with certain functions:
• Ret. Endoplasmatico. Synthesis of lipids and proteins.
• Ribosomas: protein synthesis.
• Complex of Golgi: secretion processes.
• Lisosomas: cellular digestion
• Mitocondrias: obtaining of energy (breathing).
• Citoesqueleto: filaments that give to form and mobility to the cell.
• Others: centríolos, cilia, peroxisomas ......
In addition cloroplastos the vegetal cells present/display cellular wall and. Also they have vacuolas that have the same function that lisosomas.