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General Biology I · Modules 1 to 16

See It: General Biology I

See biology happen at every scale. Each module has an animated walkthrough that links the organism, the cell and the molecule, with worked examples for every calculation, and a Lab with simulators, a practice trainer, a sorting game and real-world data scenarios. Everything runs in your browser on a computer, tablet or phone. No login, nothing graded.

How to use this: open the walkthrough first and go at your own pace with the arrow keys or Next. Then open the Lab: run the simulator, practice in the trainer with its hints and worked solutions, and try the real-world scenarios. Use the tools bar at the top of each page to pause the animations, slow them down, have the text read aloud, or get a written description of each picture. Nothing here is graded.

Module 1 Chemistry of life

Elements and isotopes, bonds and interactions, water's properties, pH and buffers, carbon and functional groups.

Start here · Animated walkthroughChemistry of life WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 1 LabWater and pH benches, pH and isotope trainer, sorting rounds, and real-world scenarios.

Module 2 Biological macromolecules

Dehydration and hydrolysis, carbohydrates, lipids, the four levels of protein structure, and nucleic acids.

Start here · Animated walkthroughBiological macromolecules WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 2 LabPolymer builder, protein folding bench, trainer, sorting rounds, and real-world scenarios.

Module 3 Cell structure

Microscopy, surface area to volume, prokaryotic vs eukaryotic cells, the endomembrane system, mitochondria and chloroplasts, the cytoskeleton and cell junctions.

Start here · Animated walkthroughCell structure WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 3 LabVirtual microscope and protein tracker, size and scale trainer, sorting rounds, and real-world scenarios.

Module 4 Membranes and transport

Fluid mosaic model, diffusion and osmosis, tonicity and water potential, channels and carriers, the sodium potassium pump, cotransport and bulk transport.

Start here · Animated walkthroughMembranes and transport WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 4 LabTransport bench and osmosis chamber, transport trainer, sorting rounds, and real-world scenarios.

Module 5 Energy, enzymes and metabolism

Thermodynamics, free energy, ATP and energy coupling, activation energy, enzyme kinetics, inhibition and allosteric regulation.

Start here · Animated walkthroughEnergy, enzymes and metabolism WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 5 LabEnzyme rate bench, energy and kinetics trainer, matching rounds, and real-world scenarios.

Module 6 Cellular respiration

Redox, glycolysis, pyruvate oxidation, the citric acid cycle, the electron transport chain and chemiosmosis, ATP yield, fermentation and regulation.

Start here · Animated walkthroughCellular respiration WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 6 LabMitochondrion bench, ATP accounting trainer, sorting rounds, and real-world scenarios.

Module 7 Photosynthesis

Chloroplasts, light and pigments, photosystems and electron flow, the Calvin cycle, photorespiration, C4 and CAM plants, and limiting factors.

Start here · Animated walkthroughPhotosynthesis WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 7 LabLeaf bench, Calvin accounting trainer, sorting rounds, and real-world scenarios.

Module 8 Cell communication

Local and long-distance signals, reception, G protein coupled receptors, receptor tyrosine kinases, second messengers, amplification, responses and apoptosis.

Start here · Animated walkthroughCell communication WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 8 LabSignaling bench, amplification trainer, ordering and matching games, and real-world scenarios.

Module 9 The cell cycle and mitosis

Chromosomes and counting rules, cell cycle phases, the stages of mitosis, cytokinesis, cyclins and checkpoints, and cancer.

Start here · Animated walkthroughThe cell cycle and mitosis WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 9 LabCell cycle bench, root tip microscope, counting trainer, stage games, and real-world scenarios.

Module 10 Meiosis and sexual life cycles

Homologs and ploidy, three life cycles, meiosis I and II, crossing over, independent assortment, nondisjunction, and gametogenesis.

Start here · Animated walkthroughMeiosis and sexual life cycles WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 10 LabMeiosis bench, counting trainer, sort and order games, and real-world scenarios.

Module 11 Mendelian genetics

Segregation and independent assortment, Punnett squares and probability, chi square, dominance patterns, epistasis, polygenic traits and pedigrees.

Start here · Animated walkthroughMendelian genetics WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 11 LabCross simulator, genetics problem trainer, pattern matching, and real-world scenarios.

Module 12 Chromosomes and inheritance patterns

Morgan's flies, sex determination and sex linkage, X inactivation, linkage and gene mapping, chromosomal alterations, imprinting and mitochondrial inheritance.

Start here · Animated walkthroughChromosomes and inheritance patterns WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 12 LabFly cross bench, mapping trainer, alteration and pedigree matching, and real-world scenarios.

Module 13 DNA structure and replication

The search for the genetic material, the double helix, Meselson and Stahl, the replication fork, proofreading and repair, telomeres and chromatin.

Start here · Animated walkthroughDNA structure and replication WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 13 LabReplication fork bench, centrifuge bench, problem trainer, matching rounds, and real-world scenarios.

Module 14 Gene expression

The genetic code, transcription, RNA processing and splicing, translation, protein targeting and mutations.

Start here · Animated walkthroughGene expression WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 14 LabGene expression machine, code trainer, sorting rounds, and real-world scenarios.

Module 15 Gene regulation

The lac and trp operons, chromatin and epigenetics, eukaryotic transcription control, RNA-level control, development and cancer genetics.

Start here · Animated walkthroughGene regulation WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 15 LabLac operon bench, eukaryotic dial board, operon trainer, sorting rounds, and real-world scenarios.

Module 16 Biotechnology

Cloning with plasmids, PCR, gel electrophoresis, sequencing, gene expression tools, CRISPR, GMOs, gene therapy, stem cells and DNA forensics.

Start here · Animated walkthroughBiotechnology WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 16 LabCloning and PCR bench, biotech trainer, toolkit game, and real-world scenarios.