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Wrapping DNA around cores of histone proteins is the first level of packing. How much does it shorten the molecule?
AAbout seven times shorter
BAbout fifty times shorter
CAbout two times shorter
DAbout ten times shorter
Answer & Solution
Correct answer: A. About seven times shorter
1. Short stretches of the double helix wrap around a core of eight histone proteins.
2. Each bead of DNA plus histones is a nucleosome, and the DNA between beads is linker DNA.
3. In this beads on a string form the molecule is about seven times shorter than the bare helix.
4. Fifty times shorter belongs to the next level of packing, once the nucleosomes coil further.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.1 Cell Division_
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