Biology852Updated Sep 1, 20268 pages

Understanding the Laws of Thermodynamics and Cellular Energy Processes

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ashlyn sheffield@ashlynsheffield
The first law of thermodynamics states that energy cannot be created or destroyed. The second law of thermodynamics states that energy cannot be converted without the loss of usable energy. Autotrophs make their own food, while heterotrophs need to ingest food to obtain energy. Photosynthesis is an anabolic process where light energy is converted to chemical energy, while cellular respiration is a catabolic process that breaks down organic molecules. Fermentation is a process that regenerates the cell's supply of NAD+ and produces a small amount of ATP when there is not enough oxygen.
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