Final answer:
The DNA in eukaryotic chromosomes is folded into a compact form by interactions with proteins.
Step-by-step explanation:
The DNA in eukaryotic chromosomes is folded into a compact form by interactions with proteins. In eukaryotes, DNA is wrapped around proteins called histones to form structures called nucleosomes. This wrapping of DNA around histones helps to condense the DNA and form a compact structure. The DNA is further compacted into a 30 nm fiber and ultimately forms linear chromosomes.