Is there any organism with no RNA or DNA?
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No their is no organism without RNA or DNA
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To my knowledge all cellular life has DNA. Cellular life includes all bacteria, archaea, and of course eukaryotes which include multicellular organisms like us. Some cells such as red blood cells may lose their DNA, but they are therefore not capable of replicating, but in a way you could consider these cells doomed and no longer truly alive.
Now, not all viruses have DNA. Many operate off of an RNA genome. HIV, the virus that causes aids, is an example of a virus whose genetic material is viral, not DNA. Whether or not viruses are considered alive is dependent on your definition of life. They are not free living, but they are capable of replicating and evolving.
It is however possible that there could be yet to be discovered primitive life that still exists that does not operate off a DNA genome. Early life is thought to have had only RNA, not DNA, as it's source of genetic material. This is known as the RNA world hypothesis . In biology, there seems to be always new discoveries of life forms that are unexpected. But for all intensive purposes, yes all terrestrial life has DNA.
Now, not all viruses have DNA. Many operate off of an RNA genome. HIV, the virus that causes aids, is an example of a virus whose genetic material is viral, not DNA. Whether or not viruses are considered alive is dependent on your definition of life. They are not free living, but they are capable of replicating and evolving.
It is however possible that there could be yet to be discovered primitive life that still exists that does not operate off a DNA genome. Early life is thought to have had only RNA, not DNA, as it's source of genetic material. This is known as the RNA world hypothesis . In biology, there seems to be always new discoveries of life forms that are unexpected. But for all intensive purposes, yes all terrestrial life has DNA.
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