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Put these planning steps in a sensible order for building a complete experiment plan from a hypothesis.

  • State the dependent variable (DV) and write an operational definition (exact measurement and timing).

  • State the independent variable (IV) and list its treatment levels (including a control level).

  • Choose replication/sample size that fits constraints and justify it (enough replicates per level to compare variability).

  • Specify the control condition(s) and what they control for (e.g., vehicle-only, no-treatment, baseline).

  • Add at least two confound-reduction strategies (e.g., random assignment, blinding, standardization, blocking).

Course
Introductory Biology Foundations: Cells, Genes, Evolution & Ecol
10 units46 lessons
Topics
Biology (introductory)Biochemistry (intro level)Cell & Molecular BiologyGeneticsEvolutionary BiologyEcology
About this course

Build a strong, integrated introduction to biology by learning core vocabulary and the cause–effect logic that connects biochemistry, cells, genes, evolution, and ecosystems. Focus on how science generates and tests explanations through hypotheses, experimental design (controls, independent/dependent variables), and evidence-based interpretation. Develop quantitative comfort with simple graphs, proportions, and frequency reasoning (including Hardy–Weinberg). Master key structure–function themes (macromolecules, enzymes, membranes, organelles), information flow (DNA→RNA→protein, mutations), energy transformations (ATP, respiration), inheritance (meiosis, Mendelian patterns), evolutionary mechanisms, and ecological energy flow and interactions.