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The ways in which an element—or compound such as water—moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle. …

Not every nutrient will go through these cycles in the same path. People often think that biogeochemical cycles are linear, and that each atom or molecule goes through the cycle step …

Biogeochemical cycles are nature's way of recycling essential elements for life, like water, carbon, nitrogen, and phosphorus. These cycles circulate these molecules through ecosystems and …

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Explore the vital role of enzymes in speeding up biochemical reactions in the body, as you learn about the different catalytic strategies enzymes use, including acid/base catalysis, covalent …

In the Calvin cycle, carbon atoms from CO 2 are fixed (incorporated into organic molecules) and used to build three-carbon sugars. This process is fueled by, and dependent on, ATP and …

The water cycle, or hydrologic cycle, is driven by the Sun’s energy. The sun warms the ocean surface and other surface water, causing liquid water to evaporate and ice to sublime—turn …

You can learn how this works in the videos and articles on pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. What happens to the NADH ? It can't just sit around in the cell, …

Intro to biogeochemical cycles Biogeochemical cycles overview The water cycle The water cycle The carbon cycle The carbon cycle The nitrogen cycle