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chromatin    
n. 核染质,染色质

核染质,染色质

chromatin
n 1: the readily stainable substance of a cell nucleus
consisting of DNA and RNA and various proteins; during
mitotic division it condenses into chromosomes [synonym:
{chromatin}, {chromatin granule}]

Chromatin \Chro"ma*tin\, n. (Biol.)
The deeply staining substance of the nucleus and chromosomes
of eukaryotic cells, composed of DNA and basic proteins (such
as histones), the DNA of which comprises the predominant
physical basis of inheritance. It was, at the beginning of
the 20th century, supposed to be the same substance as was
then termed {idioplasm} or {germ plasm}. In most eukaryotic
cells, there is also DNA in certain plasmids, such as
mitochondria, or (in plant cells) chloroplasts; but with the
exception of these cytoplasmic genetic factors, the nuclear
DNA of the chromatin is believed to contain all the genetic
information required to code for the development of an adult
organism. In the interphase nucleus the chromosomes are
dispersed, but during cell division or meiosis they are
condensed into the individually recognizable chromosomes. The
set of chromosomes, or a photographic representation of the
full set of chromosomes of a cell (often ordered for
presentation) is called a karyotype.
[Webster 1913 Suppl.]


Chromatin \Chro"ma*tin\, n. [Gr. ?, ?, color.]
1. (Biol.) Tissue which is capable of being stained by dyes.
[archaic]
[1913 Webster]


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英文字典中文字典相关资料:


  • Chromatin - National Human Genome Research Institute
    Chromatin refers to a mixture of DNA and proteins that form the chromosomes found in the cells of humans and other higher organisms Many of the proteins — namely, histones — package the massive amount of DNA in a genome into a highly compact form that can fit in the cell nucleus
  • What is Chromatins Structure and Function? - ThoughtCo
    Chromatin is DNA and proteins that help form chromosomes in a cell's nucleus Chromatin can be euchromatin or heterochromatin, affecting DNA accessibility for cell processes Chromatin condenses into chromosomes during cell division, aiding in copying genetic material
  • Biology of Chromatin - Introduction to Epigenetics - NCBI . . .
    Lastly, chromatin is dynamic and changes in histone occupancy, histone modifications, and accessibility of DNA contribute to epigenetic regulation This chapter provides an introduction to chromatin We will examine the organization of the genome into a nucleosomal structure
  • Chromatin - Definition and Examples - Biology Online Dictionary
    Chromatin is a substance made up of DNA or RNA and proteins, such as histones It condenses during cell division (mitosis or meiosis) and becomes a chromosome Chromatins are “unwound” condensed structures whereas chromosomes are highly packaged and more condensed than chromatins
  • 8. 4: Chromosomes and Chromatin - Biology LibreTexts
    Describe how chromatin structure changes during the cell cycle—from interphase (with dispersed, transcriptionally active chromatin) to mitosis (when discrete, highly condensed chromosomes are formed)
  • Chromatin: Structure And Function Within A Cell - Science ABC
    Chromatin is a way to organize the genetic information to form the blueprint of life It helps to pack the DNA into a small volume, so that it resides within the nucleus, with all the genetic information contained safely





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