D
Proteins are not synthesized in the nucleus of eukaryotic cells. Rather, mRNA is synthesized in the nucleus and exported to the cytoplasm where it is translated by ribosomes. Therefore this choice cannot be a method used by cells to regulate the amount of a protein in the cell.
Explanation:
Gene relation is important in cells especially because it enables the cells to respond to environmental stimuli. An example is the up-regulation of lac operon in the presence of lactose in the environment, and low glucose, by bacteria.
There are many ‘windows’ for gene regulation from transcription to translation in cells. More complex cells, such as those of eukaryotes have many 'windows'. Bacterial mRNA, for example, does not need splicing (because it has no introns). The splicing of mRNA in eukaryotes is an additional window for gene regulation.
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