Both prokaryotic and eukaryotic cells use to turn certain genes on or off. nucleosome packing intron segments rna transcriptase proteins

Both prokaryotic and eukaryotic cells use PROTEINS to turn certain genes on or off. These proteins are produced in response to the deficiency/overflow of a particular product which needs to be synthesized/stopped. They are an important part of gene regulation.

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for