If there are 46 chromosomes in a cell there will be 46 chromatin fibres inside the nucleus during interphase.
How many chromatin Fibres are in a cell?
These are positively-charged proteins that strongly adhere to negatively-charged DNA and form complexes called nucleosomes. Each nuclesome is composed of DNA wound 1.65 times around eight histone proteins. Nucleosomes fold up to form a 30-nanometer chromatin fiber, which forms loops averaging 300 nanometers in length.
Is the 30 nm fiber chromatin?
The structure of the 30-nm fibre is a key element in understanding chromatin compaction. It consists of a helical array of nucleosomes, each comprising a core particle wrapping ∼146 or 147 base pairs (bp) of DNA associated with a linker histone.
Where are chromatin Fibres present in a cell?
Chromatin is a complex of macromolecules composed of DNA, RNA, and protein, which is found inside the nucleus of eukaryotic cells. Chromatin exists in two forms: heterochromatin (condensed) and euchromatin (extended).
What is the difference between chromatin Fibre and chromosomes?
The chromatin further condenses to form chromosomes.
|Difference between Chromosomes and Chromatin|
|Composed of nucleosomes||They are condensed chromatin fibers|
|Visualized under electron microscope||Visualised under light microscope|
|Thin, long, uncoiled structure||Thick, compact, ribbon-like structure|
Does chromatin have RNA?
Whether RNA itself plays a direct structural role in chromatin is, however, not known. Here, we report results indicating that RNA plays a general structural role in eukaryotic chromatin. Our results indicate that purified chromatin contains significant amounts of RNA (2%–5% of total nucleic acids).
Why is chromatin only found in eukaryotes?
Chromatin is only found in eukaryotic cells, with prokaryotic cells having a different arrangement of their genetic material called a genophore – a chromosome that doesn’t contain chromatin.