Biology 1 practice
Biology 1: 588 scored questions and 49 ungraded exercises. Browse chapters and source lessons; practice free without an account.
Covers Chemical Context of Life, Cell Structure and Function and Membrane Structure and Cellular Transport, and 10 more chapters.
Scored questions use recorded source keys. Ungraded exercises support self-checking. Some items lack explanations or require review; practice scores do not establish exam readiness. No account is required.
A place to begin
Read, practice, and connect the ideas
Follow reception, transduction, and response through these lessons. Then use the chapter questions to check what you can explain without looking.
Recognize the signal and receptor
Start with how cells communicate and what makes a target cell respond.
Trace a signal transduction pathway
Connect the molecular relay to a cellular response. Practice covers the whole chapter.
Connect signaling to the cell cycle
Extend the idea to the sequence of events in a dividing cell.
Try a short session, use the explanations to revisit difficult ideas, and save questions you want to return to. Your progress stays in this browser.
Chapters and topics
- Chemical Context of Life — 12 exercises
- Cell Structure and Function — 41 exercises
- Membrane Structure and Cellular Transport — 5 exercises
- Cellular Energetics and Metabolism — 28 exercises
- Cell Communication and the Cell Cycle — 28 exercises
- Genetics and the Molecular Basis of Inheritance — 86 exercises
- Study notes — 169 exercises
- Cell Structure & Function Guide — 10 exercises
- Membrane Transport — 9 exercises
- Cellular Energetics — 9 exercises
- Cell Communication & the Cell Cycle Guide — 10 exercises
- Genetics & Inheritance — 11 exercises
- Cell Cycle, Mitosis, and Meiosis — 30 exercises
- Cell Membranes and Cellular Transport — 30 exercises
- Cellular Metabolism and Enzymes — 30 exercises
- Cellular Respiration and Photosynthesis — 30 exercises
- Cellular Transport and Communication — 6 exercises
- Characteristics and Organization of Life — 12 exercises
- Chemistry of Life and Biological Molecules — 30 exercises
- Ecology, Ecosystems, and Human Impact — 30 exercises
- Evolution, Adaptation, and Natural Selection — 12 exercises
- Evolution, Natural Selection, and Classification — 30 exercises
- Genetics, DNA, and Protein Synthesis — 30 exercises
- Scientific Method, Characteristics of Life, and Biological Organization — 30 exercises
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