An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).‘Chloroplasts are cell organelles comparable to the mitochondria of animal cells.’
- ‘Inside the cytoplasm are mitochondria and endoplasmic reticulum.’
- ‘The singlet oxygen damages cell membranes, mitochondria and cell nuclei.’
- ‘The results suggest a shared thiamine transporter for mitochondria and the plasma membrane.’
- ‘In one of the earliest steps in the evolution of eukaryotic cells, the mitochondrion was derived from an endosymbiosed bacterium.’
Early 20th century modern Latin, from Greek mitos ‘thread’ + khondrion (diminutive of khondros ‘granule’).