Does every chromosome have the same DNA?

Chromosome:

1. DNA is packed into a thread-like structure chromosome.
2. It is made by tightly coiling DNA around a protein called histones.
3. Every cell has the same DNA composition.
4. DNA is found in the nucleus or mitochondria.
5. Chromosomes vary in number and size.
6. Most of the chromosomes are known as autosomes.
7. A pair of sex chromosomes.