| Term | Definition |
|---|
| centrosome | region near nucleus -- one end of microtubules are anchored -- microtubule organizing center |
| nucleus | gene-containing control center |
| uninucleate | one nucleus |
| anucleate | without nucleus -- red blood cells |
| multinucleate | more than one nucleus -- skeletal muscle cells, osteoclasts, some liver cells |
| nuclear envelope | separates nucleoplasm from cytoplasm -- regulates passage of substances to and from nucleus |
| nucleoli | sites where ribosomal subunits are assembled |
| chromatin | genes -- granular threadlike material composed of DNA, histone proteins and RNA |
| nucleosomes | fundamental units of chromatin -- nuclear bodies -- flattened disc-shaped cores or clusters of eight histone proteins connected like beads on a string by DNA molecule |
| extended chromatin | active chromatin segments -- fine, uncoiled strands of DNA in the nucleus of a non-dividing cell |
| condensed chromatin | inactive chromatin segments -- dark-staining regions in the nucleus of a non-dividing cell composed of tightly coiled strands of DNA |
| chromosomes | chromatin coil and condense into short, barlike bodies for cell division |
| histones | spherical proteins around which DNA wraps -- part of chromatin |
| nuclear pores | tiny passageway that allows large molecules to freely pass in and out of the nucleus |
| nucleoplasm | jelly-like fluid found within the nucleus of a cell |
Combine with other sets
Share on Facebook
Share on MySpace