nucleosome – מילון אנגלי-אנגלי
Nucleosome
A
nucleosome is a basic unit of
DNA packaging in
eukaryotes, consisting of a segment of DNA wound in sequence around eight
histone protein cores. This structure is often compared to thread wrapped around a spool.
Nucleosome
Structure responsible in part for the compactness of a chromosome. Each nucleosome consists of a sequence of DNA wrapped around a core of histone (a type of protein).
Nucleosome
A beadlike structure of eukaryotic chromosomes. It consists of a core of eight histone molecules and a DNA segment of about 150 base pairs. Each nucleosome is separated from another by a linker DNA sequence of about 50 base pairs. Nucleosome structure helps to fold DNA into a compact form in the interphase nucleus. Otherwise the length of a chromosome, when linear, is many orders of magnitude greater than the diameter of the nucleus.
