Difference between revisions of "Nucleus"

From Biology-Online Dictionary | Biology-Online Dictionary
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'''Definition'''
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=== Definition ===
  
''noun, plural: nuclei''
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'''noun'''
  
(''cell biology'') The large, membrane-bounded [[organelle]] that contains the [[genetic material]], in the form of [[multiple]] [[linear]] [[DNA]] [[molecule]]s organized into [[structure]]s called [[chromosomes]]
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''adjective''
  
(''botany'') The central [[kernel]] of a [[nut]] or [[seed]], or the center of a [[starch]] [[granule]]
 
  
(''neuroanatomy'') A group of cell bodies of [[nerve cell]]s in the [[brain]] or [[spinal cord]]
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Of, pertaining to, relating to, or characterized by '''[[nucleus]]''', i.e. the large, membrane-bounded [[organelle]] that contains the [[genetic material]], in the form of [[multiple]] [[linear]] [[DNA]] [[molecule]]s organized into [[structure]]s called [[chromosomes]]
  
  
'''Supplement'''
 
  
In cell biology, the nucleus is an organelle dubbed as the ''central government o the cell''. It is because it contains the genetic material that codes for the vital functions of the cell.  The nucleus is the organelle responsible in maintaining the integrity of [[DNA]] and in controlling cellular activities such as [[metabolism]], [[growth]], and [[reproduction]] by regulating gene expression. The nucleus has three main components: the [[nucleolus]], the [[chromatin]] and the [[nuclear envelope]]. The [[nuclear envelope]] has [[nuclear pore]]s to control the [[movement]] of [[molecule]]s between the [[nucleoplasm]] and the [[cytoplasm]]. Other minor components include Cajal bodies, Gemini of coiled bodies, polymorphic interphase karyosomal association, promyelocytic leukaemia bodies, paraspeckles, and splicing speckles. The nucleus is the largest organelle in animal cells. In mammalian cells, the average diameter is 6 µm. There are cells though that lack nuclei, such as human [[red blood cell]]s.
 
  
In botany, the nucleus refers to the central [[kernel]] of a [[nut]] or [[seed]], or the center of a [[starch]] [[granule]]. In neuroanatomy, a nucleus pertains to a cluster of cell bodies of [[nerve cell]]s in the [[brain]] or [[spinal cord]].
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=== See: [[Nucleus]] for further information. ===
 
 
In other scientific fields, the term ''nucleus'' may generally refer to the [[core]] or the central part around which other parts are grouped or gathered. For instance, in Physics, a nucleus refers to the positively-charged center of an [[atom]] that usually contains the [[proton]]s and [[neutron]]s. In Chemistry, a nucleus is a fundamental arrangement of [[atom]]s that occur in [[compound]]s through [[substitution]] of [[atom]]s without a change in [[structure]]. In Astronomy, a nucleus is the center of the [[head]] of a comet or the central or brightest part of a [[nebula]] or [[galaxy]]. In Meteorology, a nucleus is a [[particle]] on which water vapor [[molecule]]s accumulate in free [[air]] to form water drops or ice crystals.
 
 
 
 
 
 
 
''Word origin:'' L: kernel, syncopated var. of nuculeus, equiv. to nucu(la) little nut (nuc-, s. of nux nut + -ula -ULE) + -leus n. suffix.
 
 
 
 
 
''See also:''
 
* [[cell]]
 
* [[organelle]]
 
''Related term(s):''
 
* [[Diploid nucleus]]
 
* [[Gametic nucleus]]
 
* [[Gracile nucleus]]
 
* [[Hypoglossal nucleus]]
 
* [[Lenticular nucleus]]
 
* [[Medial accessory olivary nucleus]]
 
* [[Nuclear actin binding protein]]
 
* [[Nuclear cardiology]]
 
* [[Nuclear chemistry]]
 
* [[Nuclear envelope]]
 
* [[Nuclear pore]]
 
* [[Nuclear-cytoplasmic ratio]]
 
* [[Pontis nervi trigeminalis nucleus]]
 
* [[Prerubral nucleus]]
 
* [[Principal sensory nucleus of the trigeminus]]
 
* [[Principal sensory nucleus of trigeminal nerve]]
 
* [[Red nucleus]]
 
* [[Solitary nucleus]]
 
* [[Subthalamic nucleus]]
 
* [[Supraoptic nucleus]]
 
* [[Supraoptic nucleus of hypothalamus]]
 
* [[Veins of caudate nucleus]]
 
* [[Ventral anterior nucleus of thalamus]]
 
* [[Vestibular nucleus]]
 
''Related form(s):''
 
* nuclear (''adjective'')
 

Revision as of 07:28, 28 July 2019

Definition

noun

adjective


Of, pertaining to, relating to, or characterized by nucleus, i.e. the large, membrane-bounded organelle that contains the genetic material, in the form of multiple linear DNA molecules organized into structures called chromosomes



See: Nucleus for further information.