The multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.

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#Unit 2. Cellular Organization

The nucleosome has an approximate twofold axis of symmetry, called the dyad axis.

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#Unit 2. Cellular Organization

DNA enters at 1 o’clock and exits at just short of 11 o’clock on one axis and they change time after 180 degree rotation

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#Unit 2. Cellular Organization

 

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#Unit 2. Cellular Organization

Of the 147 bp of DNA included in the structure, the histone-fold regions of the H3.H4 tetramer interact with the central 60 bp.

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#Unit 2. Cellular Organization

The H3.H4 tetramer forms the top half of the histone octamer. Histone H3.H4 tetramers occupy a key position in the nucleosome by binding the middle and both ends of the DNA

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#Unit 2. Cellular Organization

The two H2A.H2B dimers each associate with 30 bp of DNA on either side of the central 60 bp of DNA bound by H3 and H4.