3.2 Cell Organelles

LEQ:• How does the cytoplasm and cytoskeleton support cell

function?• Reading 3.2, 12.4 (evolution of mitochondria, chloroplasts

only)• Test Monday; projects friday

• Activator: • What’s in my head?...about transport across membranes

• Key terms – cytoskeleton, cytoplasm

3.2 Cell Organelles

The cytoplasm is the fluid-filled space between the cell membrane and the nucleus.• Metabolic reactions take place here

– Metabolic pathwaysMetabolic pathways• Diffusion of reactants, ions, etc.• Positioning of the nucleus, organelles, etc.• Cytoskeleton, vesicle traffic

3.2 Cell Organelles

Examples of simple metabolic pathways

3.2 Cell Organelles

Pathways can be classified as anabolic or catabolic

3.2 Cell Organelles

Transport, feedback controls how metabolic pathways operate

3.2 Cell Organelles

Eukaryotic cells have an internal structure.• The cytoskeleton is a protein network that has many

functions:– supports and shapes cell membrane– helps position organelles– vesicle movement– assists in cell division– aids in cell movement

• Bacteria

3.2 Cell Organelles

Vesicles can transport chemicals in bulk from the membrane

3.2 Cell Organelles

Summary:• What are some functions of the cytoplasm?• What are the functions of the cytoskeleton?