From Wikipedia, the free encyclopedia. For the fungi genus, see Chalazion (fungus) . A chalazion (/kÉËleÉªziÉn/ ; plural chalazia /kÉËleÉªziÉ/), also known as a meibomian gland lipogranuloma, is a cyst in the eyelid that is caused by inflammation of a blocked meibomian gland, usually on the upper eyelid.Chalazia differ from styes (hordeola) in that they are subacute and usually painless nodules.rom Wikipedia, the free encyclopedia. For the fungi genus, see Chalazion (fungus) . A chalazion (/kÉËleÉªziÉn/ ; plural chalazia /kÉËleÉªziÉ/), also known as a meibomian gland lipogranuloma, is a cyst in the eyelid that is caused by inflammation of a blocked meibomian gland, usually on the upper eyelid.
The nucleus, chloroplast, and mitochondria have in common is that they are membrane-bound organelles in a cell.
Mitochondria and Chloroplast carry some genetic information necessary for their function. The ribosomes are equivalent to Prokaryotic 70S ribosomes, and nyclear DNA encodes some of the component that makes up these ribosomes. Also, Mitochondria and Chloroplast have double membrane that surrounds these organelle. No one knows for sure. One hypothesis is that a long, long time ago a cell endocytosed a prokaryotic cell and these two cells formed a symbiotic relationship. The inner cell (mitochondria and chloroplasts) was protected from the environment and the outer cell received energy.