Biology is connected.
Browse a visual learning path, or jump straight to a record with search. Follow a signal into a cell, a gene into a protein, or a metabolite into a pathway.
Three ways to follow one living system
Biology becomes easier to explore when matter, information, and signals are connected.
Information
A common route for a protein-coding gene
- DNAStores sequence information in genes.Open record ↗
- is transcribed intoRNAA transcript can carry or regulate information.
- is translated intoProteinA gene product can help perform cellular work.Open record ↗
- can influenceCell traitA phenotype reflects genes plus context.Open record ↗
Matter and energy
Carbon moves; energy changes form
- PhotosynthesisUses light energy to incorporate CO₂ into organic molecules.Open record ↗
- captures light to buildSugarsCarbon compounds can enter many cell pathways.Open record ↗
- can be broken down byCellular respirationTransfers fuel electrons and helps produce ATP.Open record ↗
- supports work asATPA molecule cells use to couple energy-releasing and energy-requiring processes.Open record ↗
Signals and response
Cells detect messages and adjust their activity
- InsulinA hormone that signals changes in nutrient availability.Open record ↗
- bindsInsulin receptorA cell-surface receptor that starts intracellular signaling.Open record ↗
- starts a network that can moveGLUT4Moves to the surface in response to signals in muscle and fat cells.Open record ↗
- so the cell can take upGlucoseCan enter through transporters and feed cell metabolism.Open record ↗
This overview links selected examples across life. The paths are learning models, not a complete map of every cell or organism.
Where does a tree’s mass come from?
Trace carbon from CO₂ into plant material, then follow energy from sunlight toward ATP. Switch between the two routes and test what you understood.
Start the guided path- CO₂air
- G3Pfixed carbon
- Sugarsplant matter
- CO₂respiration
How does immune memory work?
Compare vaccination with infection, then follow a first exposure and a later encounter through innate defense, antigen presentation, and adaptive immune memory.
Start the guided path- Antigenencounter
- Innateearly defense
- T & B cellsspecific response
- Memorylater response
How does antibiotic resistance evolve and spread?
Separate mutation from selection, compare resistance mechanisms, and follow how genes move between bacteria—with an interactive population model and a real evidence-inspected case.
Start the guided path- Variationdifferences exist
- Selectionfrequency shifts
- Mechanismsdrug-specific
- Spreadinheritance · transfer
How does genetic information move from cells to traits?
Compare mitosis with meiosis using real chromosome counts, then follow allele probabilities into an HBB example without treating a family model as a prediction.
Start the guided path- DNAalleles
- Meiosisreshuffles
- Genotypeprobability
- Phenotypecontext matters
Cell Biology
Explore the structures and systems that make a cell work.
Cells · Nucleus · Mitochondria · Membranes · Cell cycleOpen Learning Path START EXPLORINGMicrobiology & Immunity
Explore microbes, host defenses, and how immune responses remember specific targets.
Bacteria · Viruses · Innate defense · Antibodies · VaccinesOpen Learning Path START EXPLORINGCell Signaling
See how cells detect messages and coordinate a response.
Insulin Signaling · GPCRs · MAPK · PI3K–AKT–mTOROpen Learning Path START EXPLORINGMetabolism & Energy
Follow how cells use fuel, transfer electrons, and make ATP.
Enzymes · Redox · Mitochondria · ATPOpen Learning Path START EXPLORINGGenetics & Molecular Biology
Follow the flow of information from DNA through RNA to protein.
DNA · Replication · Transcription · Translation · CRISPROpen Learning Path START EXPLORINGMolecular Medicine & Therapeutics
Explore how researchers find drug targets and design treatments that change biology.
Drug discovery · Antibodies · RNA medicines · KRAS · Enzyme therapyOpen Learning Path START EXPLORINGPhotosynthesis & Carbon Cycle
Follow light energy and carbon as they move through living systems.
Chloroplasts · Light reactions · Calvin cycle · CarbonOpen Learning Path BIOLOGY IN CONTEXTCase Studies
Use real investigations to connect organisms, genes, molecules, and ecosystems.
Inheritance · Outbreaks · Microbes · EnergyExplore Case Studies