Explain the various mechanisms of enzyme regulation.

Enzyme regulation is essential for maintaining cellular homeostasis and ensuring that biochemical reactions occur at appropriate rates. Several mechanisms regulate enzyme activity, which can be broadly categorized into allosteric regulation, covalent modification, substrate concentration, and feedback inhibition.

1. Allosteric Regulation:
   Enzymes often have multiple binding sites, including an active site and allosteric sites. Allosteric regulation involves the binding of an effector molecule (activator or inhibitor) to the allosteric site, which is distinct from the active site. This binding induces a conformational change in the enzyme, affecting its activity. Allosteric enzymes usually exhibit a sigmoidal (S-shaped) curve in their reaction rate vs. substrate concentration plot, which indicates cooperative __________ __________ _____ _____ ______.
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