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Question:
Significance of mitochondria in animal cell.
Answer:

Mitochondria perhaps has one of the most important functions amongst all sub-cellular organelles, after nucleus. 

The major function is to produce the energy currency of the cell, ATP through respiration or oxidative phosphorylation, and to regulate cellular metabolism. The central set of reactions involved in ATP production are collectively known as the citric acid cycle, or the Krebs cycle.

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