Assertion: mitochondrion's structure | /r/HasProperty | the nucleus
Facets:
Source sentences:
text: The most important structures are the nucleus, the endoplasmic reticulum (ER), the Golgi apparatus, mitochondria, and chloroplasts.
text: It contains a dense structure called the Nucleolus and is surrounded by the Nuclear Envelope, a structure composed of two membranes, seperated by fluid, which contain a number of nuclear pores that can allow relatively large molecules through.