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