Discussion
State whether the following is true or false.
Mitochondria can be synthesised from scratch by a cell that has lost them all.
Answer: A
Correct answer: False
Mitochondria arise only by the growth and division of existing mitochondria, in the same way cells do - a legacy of their bacterial ancestry. A cell that lost all of them could not build one, because most mitochondrial proteins are nuclear-encoded but the organelle’s own genome, membranes and import machinery cannot be assembled from nothing. It is why mitochondria are inherited maternally through the egg cytoplasm.
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