Biology Questions and Answers
- In the phase when the cell
is not dividing (interphase) is
there activity within the cell
nucleus?
In the interphase thmetabolic activity in the cell nere is intenseucleus: (^)
DNA is dtranscripteuplicating, d and RNA is produced.euchromatin is being
- How are the concepts of
chromosome, chromatin and
chromatids related? In which
phase of the cell cycle does
DNA duplicate?
Chromatin is a set of filamentous DNA
molecules dforming euchromatin aispersed in the karyoplasmnd
heterochromatin portions. Each
chromatinchromosome filament is a complet(a DNA molecule, oe (^) r
double helix). The chromatin of the
human somaticDNA molecules ( cell is f22 homologousormed by 46
chromosomes and 1 pair of sex
chromosomes).
In interphase the cell prepares itself for
division and duplication omolecules occurs. The duplication off DNA (^)
every DNA DNA double helix bound by a structuremolecule forms two identical
called centromere. In this phase each
identicalcalled chromatid. I chromosomt is also due of these pairs isring the
interphase that the chromatids begin to
condensate assuming shorter shape typical of chromosomethe thicker and
illustrations. So the phase of the cell
cycle in interphase.which DNA duplicates is the
Some Biology textbooks call the
chromosome chromatin as well as tha unique filame condensedent of (^)
structure made of two identical
chromatidsRigorously the pair of identical after the DNA duplication.
chromatids bound in the centromere are
two coand therefore they are pies of the same ctwo identicalhromosome
chromosomes (and not only one).
- What is the structure that
maintains identical chromatids
bound?
The structure that maintains identical
chromatids bound is the centromere. - How is the chromosome
region where the centromere
is located called? How are
chromosomes classified in
relation to the position of their
centromere?
The chromosomcentromere is located e region where theis called primary (^)
constriction. In microscopic view this
region is narrmost part of the chromosomower (a stricture) thane.
Accordinconstriction the chromg to the position oosomes aref the primary
classified as telocsubmetacentric or entric, acrocentric,metacentric.
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