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Cells - Prokaryotic
Descripción
(Cells) Biology Mapa Mental sobre Cells - Prokaryotic, creado por leonie1997 el 13/04/2014.
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biology
cells
Mapa Mental por
leonie1997
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Resumen del Recurso
Cells - Prokaryotic
Ultrstructure of Cells
Electron Microscopes are used to study cell structure
Many organisms still have Prokaryotic cells, including all bacteria
These cells have no nucleus
The name Prokaryotic means 'before the nucleus'
Prokaryotic cells divide in two by a process called binary fission
Functions of parts of a Prokaryotic cells
Cell Wall
Forms a protective outer layer that prevents damage from outside and also bursting if internal pressure is too high.
Plasma Membrane
Controls entry and exit of substances, pumping some of them in by active transport.
Cytoplasm
Contains enzymes that catalyse the chemical reactions of metabolism and contains DNA in a region called the nucleoid.
Pili
Hair-like structures projecting from the cell wall, when connected to another bacterial cell they can be used to pull the cells together.
Flagella
Solid protein structures, with a corkscrew shape, projecting from the cell wall, which rotate to cause locomotion.
Ribosomes
Small granular structures than synthesise proteins by translating messenger RNA. some proteins stay in the cell and others are secreted.
Nucleoid
Region of the cytoplasm that contains naked DNA, which is the genetic information of the cell.
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