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What is the simplest level of packing of the eukaryotic chromosome?
Wiki User
∙ 11y ago
nucleosome
Wiki User
∙ 11y ago
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What is the first level of control of eukaryotic gene transcription?
DNA packing and unpacking
Are parasites prokaryotic or eukaryotic?
Prokaryotic is what it is. On the cellular level, there is no nucleus and only one chromosome.
What are three levels of structure in the DNA packaging system found within a eukaryotic nucleus?
Packing ratio - the length of DNA divided by the length into which it is packagedFor example, the shortest human chromosome contains 4.6 x 107 bp of DNA (about 10 times the genome size of E. coli). This is equivalent to 14,000 µm of extended DNA. In its most condensed state during mitosis, the chromosome is about 2 µm long. This gives a packing ratio of 7000 (14,000/2).To achieve the overall packing ratio, DNA is not packaged directly into final structure of chromatin. Instead, it contains several hierarchies of organization. The first level of packing is achieved by the winding of DNA around a protein core to produce a "bead-like" structure called a nucleosome. This gives a packing ratio of about 6. This structure is invariant in both the euchromatin and heterochromatin of all chromosomes. The second level of packing is the coiling of beads in a helical structure called the 30 nm fiber that is found in both interphase chromatin and mitotic chromosomes. This structure increases the packing ratio to about 40. The final packaging occurs when the fiber is organized in loops, scaffolds and domains that give a final packing ratio of about 1000 in interphase chromosomes and about 10,000 in mitotic chromosomes.Eukaryotic chromosomes consist of a DNA-protein complex that is organized in a compact manner which permits the large amount of DNA to be stored in the nucleus of the cell. The subunit designation of the chromosome is chromatin. The fundamental unit of chromatin is the nucleosome.Chromatin - the unit of analysis of the chromosome; chromatin reflects the general structure of the chromosome but is not unique to any particular chromosomeNucleosome - simplest packaging structure of DNA that is found in all eukaryotic chromosomes; DNA is wrapped around an octamer of small basic proteins called histones; 146 bp is wrapped around the core and the remaining bases link to the next nucleosome; this structure causes negative supercoiling
What do the beads on a string level of DNA packing refers to?
chromosomes
If the chromosome no of a plant is 16 what would the chromosome no of the ploidy level of the microspore mother cell and the endosperm cells be?
Mmc's=16 as its diploidendosperm=48 as it is triploid 3n
What is the first level of control of eukaryotic gene transcription?
DNA packing and unpacking
Are parasites prokaryotic or eukaryotic?
Prokaryotic is what it is. On the cellular level, there is no nucleus and only one chromosome.
What are three levels of structure in the DNA packaging system found within a eukaryotic nucleus?
Packing ratio - the length of DNA divided by the length into which it is packagedFor example, the shortest human chromosome contains 4.6 x 107 bp of DNA (about 10 times the genome size of E. coli). This is equivalent to 14,000 µm of extended DNA. In its most condensed state during mitosis, the chromosome is about 2 µm long. This gives a packing ratio of 7000 (14,000/2).To achieve the overall packing ratio, DNA is not packaged directly into final structure of chromatin. Instead, it contains several hierarchies of organization. The first level of packing is achieved by the winding of DNA around a protein core to produce a "bead-like" structure called a nucleosome. This gives a packing ratio of about 6. This structure is invariant in both the euchromatin and heterochromatin of all chromosomes. The second level of packing is the coiling of beads in a helical structure called the 30 nm fiber that is found in both interphase chromatin and mitotic chromosomes. This structure increases the packing ratio to about 40. The final packaging occurs when the fiber is organized in loops, scaffolds and domains that give a final packing ratio of about 1000 in interphase chromosomes and about 10,000 in mitotic chromosomes.Eukaryotic chromosomes consist of a DNA-protein complex that is organized in a compact manner which permits the large amount of DNA to be stored in the nucleus of the cell. The subunit designation of the chromosome is chromatin. The fundamental unit of chromatin is the nucleosome.Chromatin - the unit of analysis of the chromosome; chromatin reflects the general structure of the chromosome but is not unique to any particular chromosomeNucleosome - simplest packaging structure of DNA that is found in all eukaryotic chromosomes; DNA is wrapped around an octamer of small basic proteins called histones; 146 bp is wrapped around the core and the remaining bases link to the next nucleosome; this structure causes negative supercoiling
Eukaryotic dna molecules have?
Eukaryotic DNA has histone proteins and a level of organization that prokaryotic DNA lacks.
What packaging group is the greatest danger?
Packing Group I (PG I) is the greatest danger; Packing Group III (PG III) is the least.
What do the beads on a string level of DNA packing refers to?
chromosomes
In the absence of oxygen eukaryotic cells are restricted to?
substrate level phosphorylation
What is an chromosome aberration?
Genetic aberrations of the DNA copy number level, such as deletions, amplifications and unbalanced translocations are termed as chromosome aberration.
What is the simplest level at life may exist?
The simplest level at which life may exist is in a cell.
What is the simplest level at which life may exists?
The simplest level at which life may exist is in a cell.
What is the simplest level which life may exist?
The simplest level at which life may exist is in a cell.
What is the simplest organizational level of the human body?
Cells are the simplest organizational level of the human body.
