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Questions and Answers
What is the diameter of a nucleosome?
What is the diameter of a nucleosome?
- 11 nm
- 1400 nm
- 6 nm (correct)
- 30 nm
Which of the following represents the highest level of DNA packing?
Which of the following represents the highest level of DNA packing?
- Nucleosomes
- Filaments
- Chromatin loops
- Metaphase chromosome (correct)
What is the diameter of chromatin fibers?
What is the diameter of chromatin fibers?
- 30 nm (correct)
- 700 nm
- 6 nm
- 11 nm
Which of the following is associated with highly condensed regions of the chromosome?
Which of the following is associated with highly condensed regions of the chromosome?
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What process occurs during metaphase regarding chromatin loops?
What process occurs during metaphase regarding chromatin loops?
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Study Notes
DNA Packing Stages
- DNA wraps around histone proteins, forming nucleosomes (6 nm in diameter).
- Nucleosomes are further packed into filaments (11 nm in diameter).
- Filaments are then organized into chromatin fibers (30 nm in diameter).
- Chromatin fibers condense into chromatin loops (300-700 nm in diameter).
- During metaphase, chromatin loops undergo further condensation to form metaphase chromosomes (1400 nm in diameter).
- Heterochromatin represents highly condensed regions of chromosomes, contributing to the compact structure.
- The process of DNA packing involves multiple stages, resulting in a highly compacted structure within the nucleus.
- This compaction is crucial for proper segregation of chromosomes during cell division.
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