What is the Structure and Function of Mitochondria Mitochondria : A single mitochondrion is present in unicellular green alga, Microsterias. Number of mitochondria varies from 50–50,000 per cell. Mitochondria of a cell are collectively known as chondriome.Historical Account : C. Benda (1897) gave the name Mitochondria (Mitos, thread + Chondrion, granules). Term … [Read more...] about What is the Structure and Function of Mitochondria