Inhaltsverzeichnis
Wie groß ist ein Chromatin?
Durch die Komplexbildung werden die langen chromosomalen DNA-Stränge in ihrer Länge um das rund 10.000- bis 50.000-fache verkürzt (kondensiert), sodass sie in den Zellkern passen.
Woher stammt der Begriff Chromatin?
Bedeutungen: [1] Genetik, Zytologie: der Komplex aus Desoxyribonukleinsäure und Proteinen, aus dem die Chromosomen bestehen. Herkunft: Der Name Chromatin kommt von griechisch χρῶμα (chrōma) „Farbe“ (also färbbare Substanz), weil sich das Chromatin mit basischen Kernfarbstoffen anfärben lässt.
What is the meaning of chromatin?
Chromatin. =. Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell’s genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus. Changes in chromatin structure are associated with DNA replication and gene expression.
What is the role of chromatin in DNA replication?
The DNA carries the cell’s genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus. Changes in chromatin structure are associated with DNA replication and gene expression. Chromatin is the material that makes up a chromosome that consists of DNA and protein.
What is the difference between DNA and chromatin and histone?
While all three structures are composed of DNA and found within the nucleus, each is uniquely defined. Chromatin is composed of DNA and histones that are packaged into thin, stringy fibers. These chromatin fibers are not condensed but can exist in either a compact form (heterochromatin) or less compact form…
What is the function of the coiled fibers of chromatin?
Chromatin fibers are coiled and condensed to form chromosomes. Chromatin makes it possible for a number of cell processes to occur including DNA replication, transcription, DNA repair, genetic recombination, and cell division.