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Biology, Explained
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Biology from the cell to the planet: the seven traits of life and why a virus isn't counted as alive, the levels from molecule to biosphere with a kidney found in 3D, the cell theory from Hooke to Virchow, bacteria versus your cells, a drawn cell to tour organelle by organelle, DNA to RNA to protein, osmosis that bursts or shrivels a cell, enzymes and lactase, photosynthesis and respiration with their equations, the stages of mitosis spotted in a drawing, meiosis and why siblings differ, Mendel's peas and Punnett squares, three domains and natural selection, food chains and the 10% rule, the carbon and nitrogen cycles, and a biodiversity crisis under way.
3h 18m5 constellations
01Name the properties of life and explain why viruses are the edge case
02Find the main organelles in a cell and say what each one does
03Predict which way water moves across a membrane
04Write and explain the photosynthesis and respiration equations
05Order the stages of mitosis and solve a Punnett square
Every lesson of Biology, Explained
15 lessons in 5 levels, about 3 hours. Level 1 is free.
Level 1What Life IsFree · 3 lessons
- What Makes Something AliveName the traits all living things share, and see why a virus is the edge case.12 min
- From Atoms to the BiospherePut life's levels of organization in order and match your body's organ systems to their jobs.13 min
- Checkpoint: The Cell TheoryState the cell theory, place its discoveries in time, and get a feel for how small cells are.13 min
Level 2Inside the CellMembership · 3 lessons
- Bacteria, Your Cells and VirusesTell prokaryotic and eukaryotic cells apart, and know why a virus is neither.13 min
- A Tour of the CellFind the main organelles, say what each one does, and follow a gene from DNA to protein.14 min
- Checkpoint: Membranes and OsmosisExplain what the membrane lets through, and predict which way water moves.13 min
Level 3Energy for LifeMembership · 3 lessons
- ATP and EnzymesExplain what ATP is for, how enzymes speed reactions up, and what makes them stop working.12 min
- PhotosynthesisWrite the equation, say where each stage happens, and trace the oxygen and the carbon.13 min
- Checkpoint: Cellular RespirationFollow glucose through respiration, know where each stage happens, and what changes without oxygen.14 min
Level 4Division and InheritanceMembership · 3 lessons
- The Cell Cycle and MitosisWalk through the cell cycle and recognize each stage of mitosis.13 min
- Meiosis: Why You're Not a CopyExplain how meiosis halves the chromosome number and shuffles it, so every egg and sperm differs.13 min
- Checkpoint: Mendel's Peas and Punnett SquaresUse Mendel's vocabulary and a Punnett square to predict a cross.14 min
Level 5The Living WorldMembership · 3 lessons
- Sorting Life: Names and Three DomainsUse the ranks of classification, the three domains, and the logic of natural selection.13 min
- Food Chains, the 10% Rule and CyclesFollow energy up a food chain with the 10% rule, and carbon and nitrogen around their cycles.14 min
- Final Test: Biodiversity and the Whole PathKnow how varied and threatened life is, and pull the whole path together.14 min
AFTER THE CORE