Each eukaryotic chromosome consists of a single molecule of DNA associated with a variety of proteins.

The DNA molecules in eukaryotic chromosomes are linear; i.e., have two ends. (This is in contrast to such bacterial chromosomes as that in E. coli that is a closed circle, i.e. has no ends.)
The DNA molecule of a typical chromosome contains

* a linear array of genes (encoding proteins and RNAs) interspersed with
* much noncoding DNA.

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