Multicellular organisms control the transcription of the genes producing these proteins to ensure that the majority of proteins are produced when required and in the appropriate cell types.
The regulation on gene expression results in energy and physical space conservation. It would be more energy-efficient to turn on the genes just when necessary because activating every gene would need a significant amount of energy from of the organism.
After they have been created, the majority of proteins can be altered covalently or by fusing with other molecules, enabling them to also be controlled in response to signals from of the extracellular environment. Protein levels in cells can be controlled by different rates of protein cleavage.
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