Chromatin is the material that makes up a chromosome that consists of DNA and protein. The major proteins in chromatin are proteins called histones.
What are the 2 components of chromatin?
Composition and Structure. Chromatin is composed of a cell’s DNA and associated proteins. Histone proteins and DNA are found in approximately equal mass in eukaryotic chromatin, and nonhistone proteins are also in great abundance.
What is chromatin heterochromatin and euchromatin?
Heterochromatin and euchromatin are two major categories of chromatin higher order structure. Heterochromatin has condensed chromatin structure and is inactive for transcription, while euchromatin has loose chromatin structure and active for transcription.
What two components of chromatin can be modified to alter the chromosome packing?
Histone proteins are the basic packers and arrangers of chromatin and can be modified by various post-translational modifications to alter chromatin packing (histone modification). Most modifications occur on histone tails.
What are ribosomes two components?
Ribosomes are composed of two subunits, the large and the small subunit, both of which consist of ribosomal RNA (rRNA) molecules and a variable number of ribosomal proteins. Several factor proteins catalyze different steps of protein synthesis by binding transiently to the ribosome.
What is the composition of chromatin?
Chromatin is composed of DNA (30-40%), RNA (1-10%) and proteins (50-60%). These constituents vary in different organisms and even in the different tissues of the same species (Table 8.2).