AP Bio Unit 3 (Energy, Cellular Respiration, and Photosynthesis) Main Menu

Interactive tutorials are blue. Student Learning Guides (SLGs) are red. 

Unit 3 notes from Mr. W.

  • The tutorials and student learning guides below have been updated to align with the College Board’s 2025 Course and Exam Description.
  • Following some widely used texts, we teach cellular respiration before photosynthesis, which is why Topics 3.3 and 3.5 precede Topic 3.4

1. Topics 3.1 – 3.2: Enzymes

Topics 3.1 – 3.3 (Enzymes) Student Learning Guide

    1. Topics 3.1 – 3.2, Part 1: Enzyme Structure and Function; Environmental Impacts on Enzymes

    2. Topics 3.1-3.2, Part 2: Enzyme Inhibition and Regulation

2. Topics 3.3, 3.5: Cellular Energy and Cellular Respiration

Topics 3.3, 3.5 (Cellular Energy and Cellular Respiration) Student Learning Guide

    1. Topic 3.3: ATP and Cell Energy

    2. Topic 3.5, Part 1: Cellular Respiration Overview

    3. Topic 3.5, Part 2: Glycolysis

    4. Topic 3.5, Part 3: The Link Reaction and the Krebs Cycle

    5. Topic 3.5, Part 4: The Electron Transport Chain and Chemiosmosis

    6. Topic 3.5, Part 5: Anaerobic Respiration and Fermentation

3. Topic 3.4. Photosynthesis

Topic 3.4 (Photosynthesis) Student Learning Guide

    1. Topic 3.4, Part 1: Introduction to Photosynthesis

    2. Topic 3.4, Part 2: Chloroplasts and the Two Phases of Photosynthesis

    3. Topic 3.4, Part 3: Light, Pigments, and Photosynthesis

    4. Topic 3.4, Part 4: The Light Reactions

    5. Topic 3.4, Part 5: The Calvin Cycle

4. Unit 3 Review Page: Objectives, Flashcards, and Quizzes

5. Additional Content

  1. Measuring Respiration with a Respirometer (Video)