Final answer:
The most substantial point of control for the synthesis of gene products is the initiation of transcription. It is at this stage that the gene expression is primarily regulated, particularly in prokaryotic cells where transcription and translation are closely linked. Therefore correct option is E
Step-by-step explanation:
The primary point of control for most genes for the amount of gene product synthesized is initiation of transcription. This process is essential for gene expression regulation, occurring at the point when a gene is first accessed to begin making RNA and protein. In prokaryotic cells, regulation of DNA transcription into RNA is the major method of controlling gene expression.
Post-transcriptional control, including the regulation of RNA splicing, RNA stability, and RNA shuttling, also plays an important role after the initial transcription step. Post-translational control refers to the regulation of gene expression after translation, including modifications to the protein that can affect its function or stability.