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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 else can I help you with?
Which cell between eukaryotic and prokaryotic is more complex?
Eukaryotic cells are generally more complex than prokaryotic cells. Eukaryotic cells have a defined nucleus that houses their genetic material, as well as membrane-bound organelles that serve specific functions. Prokaryotic cells, on the other hand, lack a defined nucleus and membrane-bound organelles.
What Cells have a well-defined nucleus?
Cells with internal membranes (and therefore a defined nuclear membrane/nucleus) are called eukaryotes.Cells with well defined nuclei are called eukaryotic. Eukaryotes include yeast, plants, and animals. Bacteria on the other hand do not have nuclei and are called prokaryotes. Interestingly, there is one very notable exception. Mammals are of course eukaroyotes, however one very specific type of cell, the red blood cell, does not have a nucleus.
Define primitive nucleus and true nucleus?
A primitive nucleus is a simple type of nucleus found in some organisms, such as prokaryotes, that lacks a membrane boundary separating it from the rest of the cell. In contrast, a true nucleus is a well-defined structure enclosed by a nuclear membrane found in eukaryotic cells, containing the genetic material and serving as the control center for the cell's activities.
What are three characteristics of Cells?
Animal cells are eukaryotic in nature, having a well-defined membrane-bound nucleus. Besides a nucleus, they have a cell membrane, mitochondria, endoplasmic reticulum, ribosomes and Golgi bodies/ Apparatuses, centrioles, lysosomes, and cytoplasm.
Is a cheek cell a eukaryote or prokaryote?
It is Eukaryote =]
What cells lack a Well-defined nucleus?
prokaryotes
The cells of bacteria lack a well defined?
The cells of bacteria lack a well-defined nucleus. Instead, their genetic material is located in the cytoplasm in a region called the nucleoid.
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.
Which cell between eukaryotic and prokaryotic is more complex?
Eukaryotic cells are generally more complex than prokaryotic cells. Eukaryotic cells have a defined nucleus that houses their genetic material, as well as membrane-bound organelles that serve specific functions. Prokaryotic cells, on the other hand, lack a defined nucleus and membrane-bound organelles.
Are chromosomes present in all cells?
Yes, chromosomes are present in all cells that have a nucleus. Chromosomes contain the genetic material of an organism and are found in the nucleus of eukaryotic cells. However, red blood cells do not have a nucleus or chromosomes.
Name three parts that every cell has?
protoplasm , cell membrane and nucleus (may be well defined or not well defined)
What two parts of the cell are equally divided during cell division?
The chromosomes and organelles are equally divided during cell division. Chromosomes are separated and distributed to each daughter cell to ensure equal genetic material, while organelles are also allocated so that each new cell has the necessary machinery to function.
WHAT domain have true nucleus?
Eukarya is the domain that has a true nucleus. Eukaryotes are characterized by having cells with a well-defined nucleus, which houses the genetic material. This distinguishes them from prokaryotes, which lack a nucleus.
What kingdom has single-celled organisms that have a cell wall and no well-defined nucleus?
The kingdom Prokarya.
Where is the location of A DNA?
DNA is found in the nucleus of eukaryotic cells, as well as in the mitochondria of both eukaryotic and prokaryotic cells. In the nucleus, DNA is organized into structures called chromosomes.
Which cells do not have a well-defined nucleus have a thick cell wall and ribosomes?
Prokaryotic cells, such as bacteria, do not have a well-defined nucleus, but instead have a nucleoid region where the genetic material is located. They also have a thick cell wall for protection and ribosomes for protein synthesis.
