Yes. Anything that isn't an organism will not contain DNA. For example, rocks do not have DNA. Additionally, some viruses have RNA instead of DNA although viruses would be covered by the first category mentioned.
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Yes, there are entities such as viruses that do not contain DNA. Viruses can contain either DNA or RNA as their genetic material.
DNA is the blueprints of the cell. It will be like trying to write a book without anything to write about. The DNA tells the cell what to do by sending mRNA.
Anything that contains DNA can undergo mutations, so yes.
No cytoskeleton is made up of proteins.It does not contain DNA.
The virus for warts and chickenpox's contain DNA.
The two-rod structures that contain the cell's DNA is the chromosome.