Dictionary » N » Nucleoid



noun, plural: nucleoids

The portion within a prokaryotic cell where the genetic material is to be found.


In contrast to eukaryotes with a nucleus, prokaryotes have a nucleoid where the genetic material can be found. The nucleoid is different from the nucleus of the eukaryotes in a way that the genetic material is not enclosed in a membrane to separate it from the cytoplasm.

Word origin: nucleo- + -oid; thus "like a nucleus".
Related forms: nucleoidal (adjective)

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... some membrane cavities (sorry, I don't remember the actual name) and the DNA is not that freely in the cytosol, but rather in something called nucleoid.

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by JackBean
Tue Sep 03, 2013 9:47 am
Forum: Cell Biology
Topic: prokartotes
Replies: 4
Views: 3639

Re: help please 1

... Why not use that all cells have genetic information? - The bacterial chromosome is circular and is organised into an amorphous structure called a nucleoid that is not enclosed in a membrane- What do they mean by amorphous in this case? - The cross-linking is so extensive that a bacterial cell ...

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by Stephen1993
Wed Feb 22, 2012 11:19 pm
Forum: Cell Biology
Topic: help please 1
Replies: 9
Views: 8914

*Where* in the cell does this occur?

... (4) Either the cytoplasm (free ribosomes) or the lumen of the rough ER (bound ribosomes) In the case of prokaryotes, activities 1-3 occur in the nucleoid, and #4 occurs in the cytoplasm.

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by aptitude
Tue Nov 08, 2011 6:53 am
Forum: Cell Biology
Topic: *Where* in the cell does this occur?
Replies: 2
Views: 5296

Prokaryotes and Eukaryotes

P: -cell division: asexual reproduction, usually by binary fission -plasmalemma: rigid, very selective -nucleoid is a circular chromosome (DNA) without nuclear envelope -http://en.wikipedia.org/wiki/Prokaryote E: -cell division: indirect: mitosis and meiosis -plasmalemma:flexible, ...

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by nikko6500
Mon Jun 20, 2011 7:18 pm
Forum: Cell Biology
Topic: Prokaryotes and Eukaryotes
Replies: 7
Views: 6015

Prokaryotes and Eukaryotes

All righty. Prokaryotes: -DNA stored in nucleoid -No membrane-bound organelles -Smaller ribosomes -Higher growth and metabolic rate -Less life time per generation Eucariotes: - Nuclei present, DNA stored in chromosomes -Membrane-bound organelles ...

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by TheVirus
Mon Jun 20, 2011 2:23 am
Forum: Cell Biology
Topic: Prokaryotes and Eukaryotes
Replies: 7
Views: 6015
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