4.Allosteric inhibitors bind to a allosteric center only D allosteric and active center

The correct answer is a) allosteric center only.<br /><br />Allosteric inhibitors are molecules that bind to a specific site on an enzyme, known as the allosteric site, which is distinct from the active site where the substrate normally binds. By binding to the allosteric site, these inhibitors induce a conformational change in the enzyme that reduces its activity or completely inhibits it. This binding does not interfere with the substrate's ability to bind to the active site but instead alters the enzyme's function, making it less effective or inactive.