Structure and function of the cell as the fundamental unit of living organisms
This course follows Chapter 8 of the supplied document to explain what a cell is, how the cell theory took shape, and how prokaryotic and eukaryotic cells are organised. It describes the cell membrane, cell wall, endomembrane system, mitochondria, plastids, ribosomes, cytoskeleton, cilia and flagella, centrosome and centrioles, nucleus and microbodies. The course stays with the document's terminology and order of ideas.
The lessons are arranged as a connected sequence. Full lesson content and assessments can be generated and published separately.
A clear introduction to the cell as the basic unit of life, distinguishing unicellular from multicellular organisms and tracing the first observations of Leeuwenhoek and Brown alongside the microscope that made them possible.
A close reading of the observations that produced cell theory, from Schwann's plasma membrane and plant cell wall to Virchow's principle that every cell comes from a pre-existing cell.
A guided survey of the cell as the fundamental unit of life, moving from the onion peel and cheek cell to the nucleus, chromosomes and DNA, the eukaryotic organelles, and the striking range of cell size and shape.
A focused study of prokaryotic cells, covering their shapes, naked genetic material, plasmids, the absence of membrane-bound organelles, and the mesosome.
A detailed lesson on the prokaryotic cell envelope, covering its three layers, the Gram positive and Gram negative classification, the glycocalyx, the fluid mosaic plasma membrane, mesosomes and chromatophores, and the flagella, pili and fimbriae that extend from the surface.
A close study of the prokaryotic ribosome as a 70S particle of 50S and 30S subunits, its association with the plasma membrane, its work in polysomes, and the membrane-free reserve material known as inclusion bodies.
A careful study of the eukaryotic plasma membrane and cell wall, covering phospholipid bilayer composition, the fluid mosaic model, membrane proteins, and the plant wall with its middle lamella and plasmodesmata.
A structured lesson on the endomembrane system, tracing how the endoplasmic reticulum, Golgi apparatus, lysosomes and vacuoles coordinate the manufacture, packaging, digestion and storage of cellular material.
A close reading of the cell's respiratory organelle, the three classes of plastids and the ribosome, with the dimensions, membranes and sedimentation values that explain how each structure performs its task.
A structured closing lesson on the cytoskeleton, the 9+2 axoneme of cilia and flagella, the perpendicular centrioles of the centrosome, the nucleus with its envelope, nucleolus, chromatin and chromosomes, and the microbodies.
Use the lesson order as your study path, then return to the matching quiz focus before moving ahead.
Work through the lessons in sequence, or jump directly to the topic you need.