Bio 151
H.w. # 1 Cell Parts and Functions
Cell Functions:
1.Plasma Membrane: Lipid bilayer which proteins are embedded
2.Cytoplasm:Semifluid matrix that contain the nucleus and other organelles
2a.Mitochondrion:Organelle which energy is extracted from food during oxidative metabolism
3. Secretory vesicles: Vesicles fusing from the plasma membrane, releasing materials to be
secreted from the cell.
4.Cytoskeleton: Maintains cell shape and assists movement of cell parts
4a.Microtubules; cylinders of protein molecules present in cytoplasm, centrioles, cilia, and
flagella
4b.Intermediate Filaments: Intertwined prtoein fibers thet provide support and strength
4c.Actin Filaments:Twisted protein fibers that are responsible for cell movement
5. nucleus: Command center of cell
5a.Nucleolus:Site where ribosomes are produced
5b.Nuclear Envelope: Double membrane between the nucleus and the cytoplasm
5c.Nuclear Pore: Opening embedded with proteins that regulates passage into and out of the
nucleus.
5d.Ribosomes small complexes of Rna and protein that are the sites of protein synthesis
6.Smooth Endoplasmic Reticulum: System of internal membrane that aides in the manufacture
of carbohydrates and lipids
6a.Rough Endoplasmic Reticulum:Internal membranes studded with ribosomes to carry out
protein synthesis
6b.Golgi Apparatus:Collects packages and distributes molecules manufactured in the cell
7.Peroxisomes:vesicle that contains enzymes that carry out a particular reactions, such as
detoxifying potentially harmful molecules
7a.Lysosomes:Vesicle that breaks down macromolecules and digest worn out cell components
8.Centrioles: Complex assembly of microtubules that occur in pairs