Question
.......... could be found in both, the nucleus and the cytoplasm:

Answer

  1. RNA
Explanation:
RNA is found everywhere- nucleus, nucleolus, mitochondria, chloroplasts, ribosomes, cytoplasm, etc.
RNAs are 3 different types- mRNA, tRNA and rRNA. mRNA and tRNA are found in the cytoplasm and rRNA in the nucleus.
The ribosomes can be free within the cytoplasm of a cell or attached to the endoplasmic reticulum but do not present inside the nucleus.
RNA and ribosomes act together resulting in the synthesis of proteins.

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