Crash Course Biology


  • Carbon and Chemical Bonds | Crash Course Biology

    Join teacher Hank Green to learn about carbon, the elemental building block of all life on earth. Hank also gives an introduction to covalent, ionic, and hydrogen bonds. In order to prepare for a course on biology, this video covers a primer of simple chemical topics, ranging from the octet rule to the difference between polar and non-polar bonds.

    Grades: 9-13+
  • Water - Liquid Awesome | Crash Course Biology

    Hank teaches us why water is one of the most fascinating and important substances in the universe. Learn about water's molecular structure, cohesion and adhesion, the life of Henry Cavendish, and many more significant aspects of life's most amazing compound: H2O.

    Grades: 9-12
  • Biological Molecules - You Are What You Eat | Crash Course Biology

    Hank talks about the molecules that make up every living thing -- carbohydrates, lipids, and proteins -- and how we find them in our environment and in the food that we eat.

    Grades: 9-12
  • Eukaryopolis: The City of Animal Cells | Crash Course Biology

    Hank tells us about the city of Eukaryopolis. Eukaryotes are animal cells responsible for all the cool things that happen in our bodies. Learn about the structure and function of the eukaryotic animal cell and how all the animal organelles allow our cells to operate as some of the most powerful factories ever evolved.

    Grades: 9-12
  • In Da Club: Membranes & Transport | Crash Course Biology

    Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. Also learn about adenosine triphosphate (ATP), osmosis, and endocytosis.

    Grades: 9-12
  • Plant Cells | Crash Course Biology

    Hank describes why plants are so amazing, including a discussion of their evolution and how their cells are both similar to and different from animal cells.

    Grades: 9-12
  • ATP & Respiration | Crash Course Biology

    In this episode, Hank describes cellular respiration and the various processes whereby our bodies create energy in the form of adenosine triphosphate (ATP). Hank walks through the full economy of cellular respiration -- from glucose to energy and everything in between.

    Grades: 9-12
  • Photosynthesis | Crash Course Biology

    Hank explains the process of photosynthesis. This extremely complex series of reactions allows plants to feed themselves on sunlight, carbon dioxide, and water and also creates some byproducts we're pretty fond of as well.

    Grades: 9-12
  • Heredity | Crash Course Biology

    Hank discusses heredity, genetics, and reproduction. To demonstrate heredity, Hank gets help from his brother John to discuss inhereted traits and Mendelian genetics.

    Grades: 9-12
  • DNA Structure and Replication | Crash Course Biology

    Hank introduces us to deoxyribonucleic acid -- also known as DNA -- and explains how it replicates itself in our cells. DNA is one of the most complicated and fundamentally important molecules known to science. Use this video to learn about the basics of genetic coding, the different types of nucleotides, and the structure and function of the DNA molecule.

    Grades: 9-12
  • DNA Transcription and Translation | Crash Course Biology

    How does DNA allow our cells to build proteins? Hank imagines the secret recipes and instruction manuals that that help explain DNA transcription and translation. Of course, this is done through an elaborate Hot Pocket analogy.

    Grades: 9-12
  • Mitosis: Splitting Up is Complicated | Crash Course Biology

    Hank describes mitosis and cytokinesis -- the series of processes our cells go through to divide into two identical copies.

    Grades: 9-12
  • Meiosis: Where the Sex Starts | Crash Course Biology

    Hank gets down to the nitty gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.

    Grades: 9-12
  • Natural Selection | Crash Course Biology

    Hank guides us through the process of natural selection, the key mechanism of evolution. This video also provides a look back at Darwin's earliest theories and the numerous principles that have spawned from his initial journey.

    Grades: 9-12
  • Speciation: Of Ligers & Men | Crash Course Biology

    Hank explains speciation -- the evolutionary process by which new biological species arise. Although different species vary drastically, the mechanisms that lead to speciation are universal and connected. Watch Hank explore speciation in terms of humans, finches, ligers, mules, dogs, and more.

    Grades: 9-12
  • Animal Development: We're Just Tubes | Crash Course Biology

    Hank discusses the means by which organisms grow and develop. Reseach into the process of early embryonic development has uncovered how even the first few hours of a zygote's existance show a differentiation into the branching taxonomical groups of the animal kingdom. 

    Grades: 9-12
  • Evolutionary Development: Chicken Teeth | Crash Course Biology

    Hank introduces us to the relatively new field of evolutionary developmental biology. By looking at biology through early embryonic growth and differentiation, we can compare the developmental processes of different organisms to determine their ancestral relationship and to discover how those processes evolved. Also, fruit flies with eyes on their legs and chickens with teeth!

    Grades: 9-12
  • Population Genetics: When Darwin Met Mendel | Crash Course Biology

    Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin and by means of the Hardy-Weinberg equation.

    Grades: 9-12
  • Taxonomy: Life's Filing System | Crash Course Biology

    Hank tells us the background story and explains the importance of the science of classifying living things, also known as taxonomy. Explore the origin of the phylogenetic tree going back to scientist Carl Linnaeus and explores the differing domains and kingdoms within the tree of life.

    Grades: 9-12
  • Evolution | Crash Course Biology

    Hank gets real with us in a discussion of evolution. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

    Grades: 9-12

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