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Dictionary » N » Nucleoid

Nucleoid

Definition

noun, plural: nucleoids

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


Supplement

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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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: 3131

*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: 1750

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: 3745

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: 3745

Sample exam question-explanation please?

... The cells that make up the oil gland are likely to have abundant a. rough endoplasmic reticulum b. smooth endoplasmic reticulum c. spliceosomes d. nucleoid regions e. signal recognition particles The correct answer is smooth ER, but why is this the case?

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by Panopticon
Thu Sep 30, 2010 2:23 am
 
Forum: Cell Biology
Topic: Sample exam question-explanation please?
Replies: 1
Views: 2044
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