Part 2: DNA Structure, Replication, and Variation
DNA Organization and Chromosomes
usually consist of a single molecule, are much smaller than eukaryotic chromosomes, and largely devoid of associated
Bacterial and viral chromosomes are often
and underwound, resulting in a
chromosomes represent paired homologs; bands may
indicating gene activity.
in eukaryotes possess extensive DNA
where transcription activity can be visualized.
Eukaryotic DNA is complexed with
and bound up in repeating
The nucleosomes are condensed in several levels of DNA
to form the compact
packed into the 10-µm nucleus.
can be used to reveal
in mitotic chromosomes that are useful in identifying chromosomes.
Eukaryotic chromosomes often exhibit large amounts of
Repetitive DNA includes
that mediate chromosomal migration.
The ends of linear eukaryote chromosomes contain
sequences that play a role in the normal process of cell aging.
Nov 15, 2008