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History of Biology
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Blod tissue  
Cytoplasm


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.

PROCARIOTIC CELLS

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.

EUCARIOTIC CELLS

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.

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