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Why is the DNA in the nucleus loose and not well defined into chromosomes?
Wiki User
∙ 15y ago
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.
Wiki User
∙ 15y ago
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Which cell between eukaryotic and prokaryotic is more complex?
Eukaryotic cell, because these have a well defined nucleus, whereas prokaryotic cells don't have a well defined nucleus
Define primitive nucleus and true nucleus?
Prokaryotic cells are primitive nucleus like structures and eukaryotic cells have well defined nucleus
What is the defining characteristic of eukaryotes?
Eukaryotes have a well defined nucleus in their cells.
Where can DNA be found in plant cells?
DNA can be found in chromosomes located in the nucleus, as well as the mitochondria and chloroplasts
Do all living things have a nucleus?
No. Only eukaryotic cells have nuclei. Admittedly, most of what we think of as living is eukaryotic (plants, animals, pretty much anything big enough to see without a microscope...) and therefore has a nucleus. Prokaryotes (bacteria) do not have nuclei.
What two parts of the cell are equally divided during cell division?
The chromosomes are held within the nucleus. The chromosomes are equally divided, but since they are in the nucleus, the nucleus is equally divided as well.
The cells of bacteria lack a well defined?
Nucleus.
What cells lack a Well-defined nucleus?
prokaryotes
Which cell between eukaryotic and prokaryotic is more complex?
Eukaryotic cell, because these have a well defined nucleus, whereas prokaryotic cells don't have a well defined nucleus
What both protons and neutrons?
Protons and neutrons are found in the nucleus. The electrons are also in the nucleus as well as chromosomes and genes.
What contain Both protons and neutron?
Protons and neutrons are found in the nucleus. The electrons are also in the nucleus as well as chromosomes and genes.
Define primitive nucleus and true nucleus?
Prokaryotic cells are primitive nucleus like structures and eukaryotic cells have well defined nucleus
What is the defining characteristic of eukaryotes?
Eukaryotes have a well defined nucleus in their cells.
Which cells do not have a well-defined nucleus have a thick cell wall and ribosomes?
prokaryote
Where can DNA be found in plant cells?
DNA can be found in chromosomes located in the nucleus, as well as the mitochondria and chloroplasts
What organelle is absent from each cell that makes it parokaryotic?
Prokaryotes do not have a well defined nucleus.
Name three parts that every cell has?
protoplasm , cell membrane and nucleus (may be well defined or not well defined)
