Histone Core and Nucleosomes Quiz

Histones are RNA molecules that facilitate transcription by modifying DNA structure.

Histones are proteins that fold DNA into nucleosomes, allowing for condensation of genetic material. (correct)

Histones are non-homologous to nucleosomes and do not interact with DNA.

Histones are structures found in bacteria that serve a similar purpose to nucleosomes.

They determine the frequency at which a gene is transcribed, but do not affect its activation or repression.

They alter the folding pattern of DNA around the histone core, affecting gene expression. (correct)

They are required for the removal of nucleosomes from DNA, facilitating transcription.

They change the physical structure of the histone proteins, but have no effect on gene expression.

You don't need to know specific histone marks for understanding gene regulation.

Histone marks are circular structures that help organize DNA into nucleosomes.

H3K27me3 is a repressive mark, typically found in transcriptionally inactive regions of the genome. (correct)

H3K27ac and H3K4me3 are always associated with active transcription, regardless of cell type or developmental stage.

<p>Chromosome condensation and organization increase as cells progress through the cell cycle, peaking during mitosis.</p> Signup and view all the answers

<p>They represent the two copies of each chromosome that are separated during mitosis.</p> Signup and view all the answers

<p>Histones are the core components of nucleosomes, around which DNA is wrapped.</p> Signup and view all the answers

<p>The $G_1$ and $G_2$ phases represent the growth and organization of chromosomes, while the $S$ phase involves DNA replication.</p> Signup and view all the answers

<p>Chromosome condensation and organization increase as cells progress through the cell cycle, peaking during mitosis.</p> Signup and view all the answers