Describe the packaging of DNA into higher order structures.

Question

10 Feb 2025

Answer :

Word Count : 579

DNA packaging into higher-order structures is a fundamental process that enables the long strands of DNA to fit within the confines of a cell's nucleus while maintaining the ability to be accessed for replication, transcription, and repair. This highly organized packaging is essential for the efficient functioning of the genome.

The packaging of DNA begins with the formation of nucleosomes, which are the basic structural units of chromatin. A nucleosome consists of approximately 147 base pairs of DNA wrapped around a core of histone proteins—specifically, two copies each of histones H2A, H2B, H3, and H4. The histones have a positive charge, which attracts the negatively charged DNA, allowing the DNA to wrap around the histone octamer in a left-handed helix. This compact structure results in a "beads-on-a-string" appearance when viewed under an electron microscope. The spacing between the nucleosomes, called linker DNA, varies in _______ ______ _________ _______ __________ _________.
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