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The fluid found in the innermost part of mitochondria is called the mitochondrial matrix.

The mitochondrial matrix is a viscous fluid that contains the mitochondria's DNA and ribosomes. It is vital to the production of ATP: The mitochondrial matrix is part of the proton gradient that runs the oxidative phosphorylation part of ATP production, and the citric acid cycle (another step in the production of ATP) occurs in this matrix.

Source: Campbell, Neil A., and Jane B. Reece. Biology (8th Edition). San Francisco: Benjamin Cummings, 2007.

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13y ago

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