Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Each nucleosome is composed of DNA wrapped around eight proteins called histones. …
Is chromatin in prokaryotes or eukaryotes?
In eukaryotic cells, chromatin consists of all the DNA within the nucleus and its associated proteins, called histones.
|Eukaryotic Chromosome||Prokaryotic Chromosome|
|Location||Nucleus||Nucleoid (region in cytoplasm)|
Do eukaryotic chromosomes have chromatin?
Eukaryotic chromosomes consist of repeated units of chromatin called nucleosomes, which were discovered by chemically digesting cellular nuclei and stripping away as much of the outer protein packaging from the DNA as possible.
Why chromatin is found only in eukaryotes?
Interestingly, chromatin not only serves as a way to condense DNA within the cellular nucleus, but also as a way to control how that DNA is used. In particular, within eukaryotes, specific genes are not expressed unless they can be accessed by RNA polymerase and proteins known as transcription factors.
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).
What are the two types of chromatin?
Chromatin exists in two forms. One form, called euchromatin, is less condensed and can be transcribed. The second form, called heterochromatin, is highly condensed and is typically not transcribed.
What do all human males inherit from their mother?
Men have a single allele of each gene on the X chromosome, inherited from their mother, and a single allele of each gene on the Y chromosome, from their father. Mitochondrial chromosomes are inherited solely from the mother. Men inherit their mother’s mitochondrial genes but do not pass them to their offspring.
What is so special about the ends of the eukaryotic chromosomes?
Telomeres are special regions, located on each end of the chromosome, that consist of repetitive sequences of base pairs. They are typically described as being like the plastic caps on the ends of shoelaces. This is because they protect the ends of chromosomes and keep them from sticking to other chromosomes.