Manipulatives
Virtual versions of the hands-on pieces you'd otherwise print and cut out — most are free-form with no answer checking, though some grade themselves and let a student try again.
DNA Ladder Builder
Drag phosphate, sugar, and base pieces onto a blank DNA ladder — practice which piece touches the base and which bases pair together.
Biomolecule Sort
Sort 20 feature cards into the 4 biomolecules — carbohydrates, proteins, lipids, nucleic acids. Some cards belong in more than one bin. Check your answers and try again if needed.
Photosynthesis & Cellular Respiration Match
Move the same four reactant/product cards across four mats — match them to chemical formulas, then a memory trick, then reactant/product categories, and finally build the cycle between the chloroplast and the mitochondria.
Prokaryotic vs. Eukaryotic Venn & Mind Map
Sort 9 cell structure cards two ways — first into a 3-circle Venn diagram, then into a mind map — to see which structures are shared between cell types and which are unique.