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Biology LibreTexts

Chapter 3 - Photosynthesis and Cellular Respiration

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    • 3.1: Energy Enters Ecosystems Through Photosynthesis
      The atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons. Atoms combine to form molecules, which are chemical structures consisting of at least two atoms held together by a chemical bond. In plants, animals, and many other types of organisms, molecules come together in specific ways to create structures called organelles. Organelles are small structures that exist within cells and perform specialized functions.
    • 3.2: Photosynthesis
    • 3.3: Cellular Respiration

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