Gram Stain of Prokaryote Bacteria Staphylococcus epidermidis

Prokaryotic Cell
Parts, Functions & Diagrams of Prokaryotes
CLASS NOTES from Science Prof Online


Single-celled prokaryotes are microbes that include bacteria and their bacteria-like cousins Archaea. Prokaryotic cells are much simpler than the more evolutionarily advanced 
eukaryotic cell

Whereas eukaryotic cells have many different functional compartments, divided by membranes, prokaryotes only have one membrane (the plasma membrane) enclosing all of the cell’s internal contents. If a eukaryotic cell is analogous to a big house with many different rooms, a prokaryotic cell is like a one-room, studio apartment.
Article Summary: Prokaryotes are simple, single-celled, yet remarkably successful organisms. Here's an overview of the structures and functions of prokaryotic cells.
Prokaryotic Cell Structures, Functions & Diagrams
Virtual Microbiology

You have free access to a large collection of materials used in two college-level introductory microbiology courses (8-week & 16-week). The Virtual Microbiology Classroom provides a wide range of free educational resources including PowerPoint Lectures, Study Guides, Review Questions and Practice Test Questions.
Prokaryotic Cell, Mariana Ruiz
Diagram of Prokaryotic Cell by Mariana Ruiz
Photos of prokaryotic & Eukaryotic Cells Button
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Page last updated: 5/2015
Fluoresced Eukaryotic Cells, US Gov, NIH

Does Your Automatic Dishwasher Kill All The Prokaryotes Living On Your Dirty Dishes?

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Prokaryotic Cell Diagram Homework Assignment
Instructor's Corner
Below is a list and description of the main cellular components of prokaryotes, followed by a labelled diagram of a prokaryotic cell. 

Internal Structures of Prokaryotic Cells
  • Plasma Membrane: The plasma membrane is a double-layer of phospholipids with associated proteins and other molecules. It is essentially the “bag” that holds all of the intracellular material and regulates the movement of materials into and out of the cell.

  • Cytoplasm: This is the gel-like fluid that the cell is filled with, inside the plasma membrane--liquid with all of the cellular organelles suspended within.

  • Cytoskeleton: It's only recently been discovered that rod-shaped bacteria and Archaea possess cytoskeletal proteins that function in a similar way to the cytoskeleton of eukaryotic cells. This scaffolding provides structural support to the cell and plays a role in cell-division.

  • Ribosomes: All cells, both prokaryotic and eukaryotic, have multiple ribosomes within. Ribosomes are the tiny protein-making machines of the cell.
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Labeled Illustration of Eukaryotic and Prokaryotic Biological Cells
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See Page 2 for homework assignment and other free teaching materials on Biological Cells!