Osmosis in 60 seconds
The definition, what happens at the membrane, and the potato practical, in one minute.
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Revision notesShort, clear notes for every spec point, with diagrams and exam tips.878 notes · GCSE, IGCSE and IB DiplomaExam questionsExam-style questions for every subtopic, with mark schemes.1310 questions · GCSE, IGCSE and IB DiplomaFlashcardsFlip each card, mark what you know and practise the rest.2867 flashcards · GCSE, IGCSE and IB DiplomaMind mapsEach topic on one page, to view online or print.59 mind maps · GCSE, IGCSE and IB DiplomaTopic testsA printable test for every topic, with the mark scheme.59 topic tests · GCSE, IGCSE and IB DiplomaPracticalsEvery practical in your course: method, variables and safety.91 practicals · GCSE, IGCSE and IB DiplomaVideosShort video lessons that explain one idea at a time.6 videos · GCSE, IGCSE and IB Diploma
Video lessons
Short lessons that explain one idea at a time. Best on a laptop, desktop or tablet.
What 'denatured' really means
Why enzymes stop working when they get too hot, in 30 seconds.
Mitosis in 60 seconds
The cell cycle and the stages of mitosis, from interphase to two identical daughter cells.
Photosynthesis in 60 seconds
What goes into a leaf, what comes out, and the photosynthesis equation.
Blood flow through the heart
The route of blood through the four chambers, the valves, and why the left ventricle wall is thicker.
Why water is special: hydrogen bonding
Polarity, hydrogen bonds, cohesion, adhesion and water as a solvent (A1.1).
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