Describe the packaging of DNA helix in a prokaryotic cell and an eukar

1.	Describe the packaging of DNA helix in a prokaryotic cell and an eukaryotic nucleus.
Answer» Packaging of DNA Packaging of DNA in eukaryotes • The proteins associated with DNA are of two types—basic proteins (histone and protamine) and acidic non-histone chromosomal (NHC) proteins. • The negatively charged DNA molecule wraps around the positively charged histone proteins to form a structure called nucleosome. • The nucleosome core is made up of four types of histone proteins—H₂A, H₂B, H3 and H₄— occurring in pairs. • 200 bp of DNA helix wrap around the nucleosome by 1¾ turns, plugged by H₁ histone protein. • Repeating units of nucleosomes form the chromatin in nucleus, which is a thread-like structure. • The chromatin is packed to form a solenoid structure of 30 nm diametre.

Describe the packaging of DNA helix in a prokaryotic cell and an eukaryotic nucleus.

Answer»

Packaging of DNA

Packaging of DNA in eukaryotes

• The proteins associated with DNA are of two types—basic proteins (histone and protamine) and acidic non-histone chromosomal (NHC) proteins.

• The negatively charged DNA molecule wraps around the positively charged histone proteins to form a structure called nucleosome.

• The nucleosome core is made up of four types of histone proteins—H₂A, H₂B, H3 and H₄— occurring in pairs.

• 200 bp of DNA helix wrap around the nucleosome by 1¾ turns, plugged by H₁ histone protein.

• Repeating units of nucleosomes form the chromatin in nucleus, which is a thread-like structure.

• The chromatin is packed to form a solenoid structure of 30 nm diametre.