Question

The mitochondrion (plural mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms. Some cells in some multicellular organisms may, however, lack them (for example, mature mammalian red blood cells).

Answer 1

Actually you have already answered the question actually the question could be that Which organisms have a lack of mitochondrion and what are their structure this question implies your question(Answer)here is your Answer(Question) ok........