Energy and matter in biological systems
10 videos
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Biology - Energy and Matter in Living Systems
Learn how energy flows one-way through ecosystems while matter cycles endlessly. Discover why only 10% of energy transfers between levels and how atoms get reused.
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Biology - The Four Major Biomolecules
Learn about the four essential biomolecules—carbohydrates, proteins, lipids, and nucleic acids—that make all life possible and their unique roles in your body.
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Biology - Building Biomolecules: Monomers to Polymers
Learn how carbon backbones, monomers, and polymers form through dehydration synthesis and break apart via hydrolysis to create life's essential biomolecules.
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Biology - Photosynthesis: How Plants Make Food
This video explains photosynthesis: how plants convert sunlight, water, and CO2 into glucose and oxygen through light-dependent reactions and the Calvin cycle.
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Biology - Cellular Respiration: Turning Food into Fuel
This video explains cellular respiration: how cells convert glucose and oxygen into ATP energy through glycolysis, Krebs Cycle, and the electron transport chain.
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Biology - Photosynthesis vs. Cellular Respiration
This video explains how photosynthesis and cellular respiration are mirror processes that work together, recycling matter and energy between plants and living organisms.
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Biology - Energy Flow and Trophic Pyramids
Learn why ecosystems have many plants but few predators. Explores energy flow through trophic levels and the 10% rule that limits energy transfer in food chains.
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Biology - The Carbon Cycle
This video explains the carbon cycle, showing how carbon atoms move through the atmosphere, plants, animals, soil, fossil fuels, and oceans in a continuous loop.
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Biology - The Nitrogen Cycle
Learn how bacteria convert atmospheric nitrogen into usable forms for plants and animals, and how nitrogen cycles through ecosystems to sustain all life.
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Biology - Tracing Energy and Matter Through an Ecosystem
This video explains how energy flows one-way through ecosystems while matter cycles repeatedly, tracing atoms from sunlight through plants, animals, and decomposers.