4. In humans and all creatures constructed of eukaryotic cells, the DNA always resides in the.

Nucleus (as nuclear DNA), mitochondrial (mitochondrial DNA) and chloroplasts.

DNA is packed tightly around protein called Histones, in Eukaryotes cells; so that many molecules can easily be held together as chromosomes.

Chromosomes are thread-like structure in nucleus of cells. The histones provide support to the DNA molecule

The part DNA molecule coded for by a polypeptide is GENE, therefore in the nucleus of cells, DNA contains GENE, and the gene and DNA are packed in chromosomes, DNA appears as circular DNA mitochondria