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Science · 9th Grade
Cell Theory
Three statements that underpin the whole of biology.
How to use it
Every biology topic connects back to one of these three.
Free · print-ready PDF · US Letter and A4
- Grade
- 9th Grade
- Ages
- 14–15
- Subject
- Science
- Pages
- 1
The rest of the 9th Grade wall
49 more posters, all free to print — 11 of them here.
DNA StructureA twisted ladder, and the base pairing that makes copying possible.From Gene to ProteinTranscription then translation — two steps, two locations.Photosynthesis and RespirationTwo equations that are almost exact mirrors of each other.Punnett SquaresPredicting offspring ratios from two parents' genes.Evidence for EvolutionFive independent lines of evidence, all pointing the same way.EnzymesBiological catalysts, and the two things that destroy them.HomeostasisKeeping the inside steady while the outside changes.Cell Structure & FunctionEvery organelle with its job, plus transport across the membrane.Periodic TrendsAtomic radius, ionisation energy and electronegativity, with arrows for each trend.Levels of Ecological OrganisationFrom one organism up to the whole biosphere.The Carbon CycleWhere carbon goes, and where humans changed the balance.