Samenvatting celbiologie
Les 3
Which cellular structure is common to all 3 domains of life?
Phospholipid bilayer cell membrane.
, The cytoskeleton
The cytoskeleton is a network of fbers extending throughout the
cytoplasm. And which plays a major role in organizing the structures, and
activities of the cell, is composed of Three types of molecular structures:
microtubules, microflaments intermediate flaments.
It organizes the cell’s structures and activities, anchoring many
organelles, transport of vesicles.
Dynamic system: depending of needs cell.
Property Microtubules (Tubulin
polymers)
Structure Hollow tubes; wall consists of 13
columns of tubulin molecules.
Diameter 25 nm with 15-nm lumen
Protein subunits Tubulin
Main functions Maintenance of cell shape.
Cell motility.
Chromosome movements in cell
division.
Organelle movements.
Property Microflaments (Actin flaments)
Structure Two intertwined strands of actin
Diameter 7 nm
Protein subunits Actin
Main functions Maintenance of cell shape.
Changes in cell shape.
Muscle contraction.
Cytoplasmic streaming.
Cell motility.
Cell division.
Property Intermediate Filaments
Structure Fibrous proteins supercoiled into
thicker cables
Diameter 8 – 12 nm
Protein subunits One of several diferent proteins of
the keratin family
Main functions Maintenance of cell shape.
Anchorage of nucleus and certain
other organelles.
Formation of nuclear lamina.
Les 3
Which cellular structure is common to all 3 domains of life?
Phospholipid bilayer cell membrane.
, The cytoskeleton
The cytoskeleton is a network of fbers extending throughout the
cytoplasm. And which plays a major role in organizing the structures, and
activities of the cell, is composed of Three types of molecular structures:
microtubules, microflaments intermediate flaments.
It organizes the cell’s structures and activities, anchoring many
organelles, transport of vesicles.
Dynamic system: depending of needs cell.
Property Microtubules (Tubulin
polymers)
Structure Hollow tubes; wall consists of 13
columns of tubulin molecules.
Diameter 25 nm with 15-nm lumen
Protein subunits Tubulin
Main functions Maintenance of cell shape.
Cell motility.
Chromosome movements in cell
division.
Organelle movements.
Property Microflaments (Actin flaments)
Structure Two intertwined strands of actin
Diameter 7 nm
Protein subunits Actin
Main functions Maintenance of cell shape.
Changes in cell shape.
Muscle contraction.
Cytoplasmic streaming.
Cell motility.
Cell division.
Property Intermediate Filaments
Structure Fibrous proteins supercoiled into
thicker cables
Diameter 8 – 12 nm
Protein subunits One of several diferent proteins of
the keratin family
Main functions Maintenance of cell shape.
Anchorage of nucleus and certain
other organelles.
Formation of nuclear lamina.
