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Yes. Eukaryotic cells have both DNA and RNA.

The bases sequences in DNA indirectly code for protein structures. However, DNA molecules can not directly synthesize proteins.
Therefore, DNA needs something to help it. This is RNA.

RNA is more important in the process of translation (protein production) because rRNA, tRNA, and mRNA are all directly involved. DNA itself is only the template for these mRNAs.

There are certain viruses that contain only RNA, which is viable because as long as there are the necessary RNAs, then protein synthesis is possible. Conversely, with only DNA, it would not be possible to synthesize proteins, and the organism could not survive.

Eukaryotic cells will always have both.
Certain prokaryotic cells have only RNA, but most well have DNA as well.

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