There are multiple levels of regulation for gene expression. This is especially true for the genes of eukaryotic cells because of their more complex cellular structures and processes. For example, DNA of eukaryotes are packaged into chromosomes along with histone proteins. These histones can be methylated or acetylated to tighten or loosen the DNA that is wound up to it.
In both eukaryotes and prokaryotes, gene expression can be regulated at the level of _____.
C. mRNA splicing
D. All of the above
E. transcription and translation only
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