15 Questions
What is the primary function of ATP-dependent chromatin-remodeling complexes in nucleosomes?
To dynamically change chromatin structure
Which type of chromatin is characterized as highly condensed and gene-poor?
Heterochromatin
What is the result of attractions between nucleosomes in chromatin fibers?
Chromatin compaction
What is the significance of covalent modifications and histone variants in chromatin?
They regulate gene expression
What is the primary difference between euchromatin and heterochromatin in terms of gene density?
Euchromatin is gene-rich, while heterochromatin is gene-poor
What is the result of chromosome loops decondensing?
The genes within them are expressed
What is the characteristic of heterochromatic regions in the nucleus?
They are localized to specific territories
What is the role of large protein rings in chromosomal DNA organization?
They organize chromosomal DNA into loops
What is the characteristic of polytene chromosomes?
They are uniquely useful for visualizing chromatin structures
What is the effect of histone modification on chromatin structure?
It can act in concert with histone variants to control chromosome functions
What is the basic unit of eukaryotic chromosome structure?
Nucleosome
What is the primary function of chromatin remodeling?
To allow access to DNA for gene expression
What is the primary characteristic that distinguishes heterochromatin from euchromatin?
Density of gene expression
Which of the following is an example of histone modification?
Acetylation of histone tails
What is the result of chromosome condensation?
Decreased DNA accessibility
Test your understanding of chromatin structure, including eu- and heterochromatin, and the organization of chromosomes, including centromeres, telomeres, and replication origins. This quiz covers the basics of gene arrangement and DNA molecule structure.
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