A defining characteristic of eukaryotic organisms is that they
A. use the leucine zipper primarily for the production of the amino acid tryptophan.
B. carry out protein synthesis only in the presence of the cAMP molecule.
C. have only operons to assist in gene expression.
D. have their transcription occurring in the nucleus and translation in the cytoplasm.
E. have their transcription occurring in the cytoplasm and translation in the nucleus.
Answer: D
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