Biology
High School (11–12)
Cell Biology › Cell Structure and OrganellesCell Biology › Transport Across the Cell MembraneChapter 5Cell: The Unit of Life
Every living thing, from a bacterium to a banyan tree, is built of cells. Inside each one is a busy city of membranes and organelles, each with its own job. In this chapter you meet the cell theory, compare prokaryotic and eukaryotic cells, and tour the organelles: the membrane and wall, the endomembrane system, mitochondria and plastids, ribosomes, the cytoskeleton and the nucleus. Python compares cell sizes and works out why cells stay small.
Part of Biology · High School (11–12) (chapter 5)
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Cell Theory, Prokaryotes and Eukaryotes
What a cell is, the cell theory and who built it, an overview of cells and their sizes and shapes, and the prokaryotic cell with its envelope, mesosomes, ribosomes and inclusion bodies.
The Cell Membrane, Wall and Endomembrane System
The fluid mosaic model of the cell membrane and how things cross it, the plant cell wall, and the endomembrane system: endoplasmic reticulum, Golgi apparatus, lysosomes and vacuoles.