Root apical meristem

Growth  occurs  just  behind  the  tip  in  three  overlapping  zones  of  cells at  successive  stages of  primary  growth.  These  are  the  zones  of  cell  division,  elongation, and differentiation

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In other cells, mitochondria remain fixed at points of high energy demand.

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In mitochondria, the metabolism of sugars is complete: allows 15 times more ATP to be made from a sugar than by glycolysis alone.

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Functions of Mitochondria-

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mtDNA is located in the mitochondrial matrix, and in the rapidly growing cells, mtDNA is often seen in regions devoid of densely stacked cristae.

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A human cell has about 1000–2000 mtDNA molecules

A human egg has about 500,000 mtDNA molecules

A sperm has only about 100 mtDNA molecules