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. This is also known as chromatin modification. However, this mechanism is not present in prokaryotes.
The most important means of controlling gene expression in both prokaryotic and eukaryotic cells is at the level of _____.
B. chromatin modification
D. DNA packing
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