18 Questions
What type of chromatin is generally associated with activation of transcription?
Euchromatin
Which type of chromatin is generally associated with repression of transcription?
Heterochromatin
What type of chromatin has a more open structure and less compaction level?
Euchromatin
Which type of chromatin has a more condensed structure and higher compaction level?
Heterochromatin
What type of modifications on histone proteins are generally associated with activation of transcription?
Acetylation
Which type of modifications on histone proteins are generally associated with repression of transcription?
Methylation
Which type of chromatin is transcriptionally inactive in general?
Constitutive heterochromatin
What is a characteristic of euchromatin?
Transcriptionally active
Which region can interconvert between euchromatin and heterochromatin?
Facultative heterochromatin
During interphase, in which type of chromatin are most chromosomal regions euchromatic?
Euchromatin
Which type of chromatin undergoes little gene transcription in metaphase chromosomes?
Metaphase chromatin
What happens to the compaction level of sister chromatids by the end of prophase?
They are entirely heterochromatic
What type of chromatin is typically less condensed, more accessible for gene expression, and actively transcribed?
Euchromatin
Which proteins are involved in compaction of eukaryotic chromatin by binding to the DNA backbone?
Histone proteins
What is the role of nucleoid-associated proteins (NAPs) in prokaryotic DNA compaction?
Introduce bends and folds in DNA
Which type of chromatin is typically highly condensed, transcriptionally inactive, and involved in structural functions like centromeres?
Heterochromatin
In eukaryotic chromosomes, which histone protein acts as the linker histone between nucleosomes?
H1
What is the approximate length of a single set of human chromosomes when stretched end to end?
~3 meters
Test your knowledge on the compaction levels of interphase chromosomes in eukaryotic cells. Explore the differences between heterochromatin and euchromatin, and learn about the types of heterochromatin found in eukaryotic chromatin compaction.
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