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How do genes influence the enzymes that cells make?
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Biochemistry
In biochemistry, researchers study the chemical substances and processes that occur in living organisms and cells. In particular, various processes by which cells gain energy, such as epinephrine-stimulated cAMP synthesis, have been deduced through the study of biochemistry.
Genes serve as the molecular blueprint for enzymes, directing their synthesis through a precise sequence of biological processes. The relationship is fundamentally defined by the one gene-one enzyme hypothesis, which posits that a gene provides the instructions for creating a specific enzyme or polypeptide chain, though it is now understood that some enzymes require multiple genes to encode their various structural units.12
The process of gene expression involves several key stages:
- Transcription: When an enzyme is needed, the specific gene segment of DNA is copied into messenger RNA (mRNA).32
- Translation: This mRNA travels to ribosomes, where the genetic code—read in three-nucleotide sequences called codons—is translated into a specific chain of amino acids.34
- Folding and Activation: The resulting polypeptide chain folds into a unique three-dimensional structure essential for the enzyme's catalytic activity. Some enzymes may undergo further post-translational modifications or require cofactors to become fully functional.56
Gene regulation ensures that enzymes are produced only when necessary, responding to developmental stages or environmental signals through complex control mechanisms.62