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Free biology worksheets
Printable worksheets for high school and AP Biology. Each is free as a PDF; the answer keys, with a short explanation for every answer, are part of the Teacher plan.
Protein synthesis worksheet: transcription and translation
A free, printable worksheet for high school and AP Biology. Students follow a real human gene — β-globin (HBB) — from DNA to protein, then see how one changed base causes sickle-cell hemoglobin.
Cellular respiration worksheet
A free, printable worksheet for high school and AP Biology. Students follow one glucose through glycolysis, the citric acid cycle and the electron transport chain, explain how ATP synthase uses the proton gradient, and compare fermentation.
Mitosis worksheet: the cell cycle and the stages of mitosis
A free, printable worksheet for high school and AP Biology. Students work through interphase, every stage of mitosis and cytokinesis in a human cell with 46 chromosomes, then the checkpoints that control the cycle.