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Euchromatin is loosely coiled DNA that is transcriptionally active. An increased amount of euchromatin indicates an active cell. Heterochromatin is tightly packed DNA that is transcriptionally innactive.
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∙ 14y ago
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∙ 14y ago-> Euchromatin is a lightly packed form of chromatin (DNA, RNA and protein) that is rich in gene concentration.Heterochromatin is a tightly packed form of DNA.
->Euchromatin is found in both cells with nuclei (eukaryotes) and cells without nuclei (prokaryotes) while heterochromatin is found only in eukaryotes.
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∙ 12y agoHeterochromatin is more densely packaged than euchromatin and is much less transcriptionally active. Examples of heterochromatic DNA would be the centromeric and telomeric regions of a chromosome.
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∙ 14y agoEuchromatin is loosely coiled DNA that is transcriptionally active. Heterochromatin is tightily packed DNA that is transcriptionally inactive.
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∙ 14y agoHetrochromatin is non-expressed material that being stained significantly in G-banding, predominantly repeated sequences. Where as Euchromatin is expressed material that is lightly stained.
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∙ 13y agoheterochromatin are lightly stained and euchromatin are darker stained is it correct besides this i had no knowledge
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Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?
Heterochromatin is dark stained area caused by condensed chromosomes or DNA. Heterochromatin is located near between the inner membrane and the nucleoplasm.
DNA that is spread out in a non dividing cell is called?
Chromatin Chromatin
What is the loose combination of DNA and proteins that looks like spaghetti?
this is known as euchromatin, DNA tightly bound to proteins is heterochromatin. Whether a DNA is bound up with protein in the cell or not depends on whether that part of the DNA is active in the cell at a particular time
Why is the DNA in the nucleus loose and not well defined into chromosomes?
In the interphase nucleus the chromatin exists in two forms; loosely coiled form called euchromatin and tightly coiled form called heterochromatin. These two types become much more coiled to form the chromosome at the time of cell division. Now come to the point. When DNA is a bit loosely colied, that is, in the euchromatin, its bases are available for transcription. On the other hand, when it is in the form of heterochromatin, the bases are not accessible for reading by RNA polymerase, hence transcription is not possible. As majority of genes must be transcribed in the nucleus, so the chromosomes must be decondensed to appear in the form of chromatin, and that too in the form of euchromatin. If the DNA remained organized in the form of chromosomes, genes would remain inactive in the sense that they would not be acessible for transcription.
In eukaryotes what is active transcription generally associated with?
Both euchromatin and histone acetylation.
What are loosely coiled fibers containing protein and DNA within nucleus?
Chromatin is the generic term for DNA (not "fiber") wound around proteins called histones. From the description you've given, it sounds like you're talking about euchromatin.There are generally two types of chromatin: euchromatinand heterochromatin. Under the microscope, heterochromatin tends to stay at the periphery of the nucleus, while euchromatin tends to stay central in the nucleus. Also microscopically, euchromatin is a bit lighter (ie, it doesn't stain as heavily) than heterochromatin, reflecting the fact that euchromatin is less dense than heterochromatin. The decreased density has to do with euchromatin being loosely wound around histones, whereas heterochromatin is wound rather tightly. Heterochromatin also has a number of other chromatin-modifying proteins around that prevent it from coming undone easily.The functional difference between the two types of chromatin has to do with how effectively DNA transcription (the process by which DNA is transcribed to RNA) can occur. The dense heterochromatin is so tightly wound and so tightly packed with associated proteins that the DNA transcription machinery can't get access to the DNA contained within the heterochromatin. Only the loosely wound euchromatin will permit the machinery to gain access to its DNA. Therefore, generally euchromatin contains DNA that is being actively transcribed, while heterochromatin is transcriptionally silent.THE ANSWER IS CHROMATIN!!
Is euchromatin transcribed?
Euchromatin is a lightly packed form of chromatin which is the molecular substance of a chromosome. It is often but not always actively transcribing which means the information in a strand of DNA is copied into a new molecule of RNA.
Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?
Heterochromatin is dark stained area caused by condensed chromosomes or DNA. Heterochromatin is located near between the inner membrane and the nucleoplasm.
What is the the relationship of chrosomes to chromatin?
Chromatin is the stuff they´re made out of. Densely condensed chromatin is known as heterochromatin and not fit to transcribe, loosely packed euchromatin can be transcribed easily.
How do DNA methylation and histone acetylation affect chromatin structure and the regulation of transcription?
When chromatin is tightly compacted and dense, it's called Heterochromatin. When chromatin is loosely packed, its called Euchromatin. Euchromatin is easily accessible to transcription enzymes, while herterochromatin makes transcription impossible because the enzymes cannot access the DNA. Therefore, a gene within heterochromatin cannot be expressed. Also, look up how histone modifications such as histone acetylation affect gene expression.
What is DNA in a non-dividing cell called?
It's called euchromatin, and is attached to histones.
DNA that is spread out in a non dividing cell is called?
Chromatin Chromatin
What is the loose combination of DNA and proteins that looks like spaghetti?
this is known as euchromatin, DNA tightly bound to proteins is heterochromatin. Whether a DNA is bound up with protein in the cell or not depends on whether that part of the DNA is active in the cell at a particular time
Why is the DNA in the nucleus loose and not well defined into chromosomes?
In the interphase nucleus the chromatin exists in two forms; loosely coiled form called euchromatin and tightly coiled form called heterochromatin. These two types become much more coiled to form the chromosome at the time of cell division. Now come to the point. When DNA is a bit loosely colied, that is, in the euchromatin, its bases are available for transcription. On the other hand, when it is in the form of heterochromatin, the bases are not accessible for reading by RNA polymerase, hence transcription is not possible. As majority of genes must be transcribed in the nucleus, so the chromosomes must be decondensed to appear in the form of chromatin, and that too in the form of euchromatin. If the DNA remained organized in the form of chromosomes, genes would remain inactive in the sense that they would not be acessible for transcription.
What proteins are found in chromatin?
You may be looking for the term "histones," which are the protein component of chromatin (which comprises chromosomes).Histones are proteins around which DNA winds, making it dense and compact; this results in the denser form of chromatin, known as "heterochromatin." Histones thus play a role in regulating the expression of genes (because they cannot be expressed whilst compacted). When histones are modified, they can change shape or charge and release the tightly-wound DNA so that the genes can be expressed; this looser form of chromatin is known as "euchromatin."Together, heterochromatin and euchromatin make up chromosomes.http://en.wikipedia.org/wiki/Histone
What is condensed visible form of chromatin?
Heterochromatin Heterochromatin is a tightly packed form of DNA or condensed DNA, which comes in multiple varieties. These varieties lie on a continuum between the two extremes of constitutive heterochromatin and facultative heterochromatin. Both play a role in the expression of genes.
What do you call the section of dna that is transcribed?
Euchromatin.
