1. 2.3b: Cell Structure: What are Cells Made of?

2. 2 Basic types of Cells Comparison of Prokaryotic and Eukaryotic Cells
DNA
Single “naked” circle;
plasmids
Stored in membrane-bound
nucleus
Membrane-enclosed organelles NO
YES
Examples
Bacteria
Fungi, plants, animals, protists

3. Prokaryotic vs. Eukaryotic
Eukaryotic cells-
DNA in a membrane-enclosed nucleus. (primary distinguisher)
Membrane-enclosed organelles
Prokaryotic cells-
No nucleus, no membrane bound organelles.

4. Eukaryotic Cells

5. Plasma Membrane and Cytosol
Plasma Membrane (cell membrane_
Eukaryotic and Prokaryotic cells
a double layer of phospholipids, and special proteins.
Function- control what goes in and out of the cell.
Some molecules can go through the cell membrane in and out of the cell and some can't,
We call this semipermeable!
It is almost as if the membrane chooses what enters and leaves the cell.

7. Plasma Membrane and Cytosol
Important for homeostasis!
Cytosol
Eukaryotic and prokaryotic cells
Made mostly of water and enzymes
Everything in the cell – (the nucleus and the organelles) sit in the cytosol.
Cytoplasm- cytosol and all the organelles, but not the nucleus.