It is false for viruses:

Explanation

Viruses do not contain both DNA and RNA simultaneously. They can have either DNA or RNA as their genetic material, but not both at the same time. A virus is classified as either a DNA virus (contains DNA) or an RNA virus (contains RNA). For example, the influenza virus is an RNA virus, while the herpes simplex virus is a DNA virus. Some viruses have single-stranded genetic material (either DNA or RNA), while others have double-stranded genetic material. The presence of either DNA or RNA is one of the defining characteristics used to classify viruses into different groups.