A-Level · 9700 · Interactive simulations
14 unique simulations18 lessons2 sources
Every simulation here runs the real model — the applets a teacher would put on the board, from PhET and GeoGebra, not a video of one. Pick a topic, open a card inside its lesson to run it next to the notes, or jump straight to the source. A simulation that fits several lessons is listed under each of them (27 cards in all). Back to the A Level Biology course →
A virtual colorimeter: shine light through copper sulfate solution of any concentration and read its absorbance.
On Three Atoms, make the middle atom the most electronegative and bend the molecule: a net dipole appears, as in water.
Choose water, switch between solid, liquid and gas, and heat or cool the container while you watch the molecules.
Drop salt or sugar into water at the molecular scale and watch the water molecules surround the particles.
An energy profile for a simple reaction (H₂ + I₂) with a Catalyst button that switches the catalysed route on and off.
On Simple Diffusion O2 crosses the bilayer unaided; on Facilitated Diffusion Na+ cannot cross until you add a channel protein.
Work through the screens in order: O2 diffuses straight through, Na+ needs a channel, and the Na+/K+ pump needs ATP.
Two gases held apart by a divider: set particle number, mass, size and temperature, then remove the divider.
On Expression, put a transcription factor and RNA polymerase on the gene, then drop a ribosome on the mRNA to make the protein.
On Active Transport, add the sodium-glucose cotransporter: glucose enters only alongside Na+ moving down its gradient.
Gas particles behind a divider: choose how many there are and how hot they are, then remove the divider.
A diagram of the heart to label, with a check on your answers.
Two gases either side of a divider: set how many particles there are, then remove the divider.
Sliders for infection rate and time: watch an infection sweep through a population of 100 people.
Add a mutation and a selection pressure to a rabbit population: a stand-in for resistance spreading through bacteria.
Build a membrane with a sodium-potassium pump and a sodium-glucose cotransporter, as in a proximal convoluted tubule cell.
Press Stimulate Neuron with the Potential Chart open: Na+ gates open first, then K+ gates, as the trace spikes and resets.
Insert a sodium-potassium pump, voltage-gated channels and ligand-gated channels into a membrane and control when ions cross.
On Expression, drag a transcription factor and RNA polymerase onto the gene, then a ribosome onto the mRNA to build each protein.
Assemble the lac operon from its parts (promoter, operator, lacI gene, lacZ gene), then inject lactose.
Build all three proteins on Expression: each gene is transcribed into its own mRNA and translated into a different protein.
Choose whether a fur-colour mutation is dominant or recessive, breed the rabbits and read genotypes from the pedigree.
Set the degrees of freedom and a chi-squared value and read the probability from the chi-squared distribution.
On the mRNA screen, raise the positive transcription factor concentration, then add the negative factor and watch mRNA output fall.
Build the lac operon on a strand of bacterial DNA, then switch it on by injecting lactose.
Add a mate and the brown-fur mutation, then turn on wolves: watch which fur colour takes over on the Population graph.
On Lab, add a mate, the long-teeth mutation and tough food, then open Proportions: the trait's share shifts each generation.
Each simulation stays the property of its source and is credited on the card inside the lesson. Back to the A Level Biology course →