Question

An allosteric enzyme usually has

• A. One active site
• B. One active site and one allosteric site
• C. Active site and two types of allosteric sites
• D. Two types of active sites

Answer 1

The correct option is B One active site and one allosteric site

The enzyme combines with the substrate to form an enzyme-substrate complex. The part of the enzyme where substrate molecules get attached is known as the active site. The substrate is converted to the product as a result of its interaction with the enzyme active site. The allosteric site of an enzyme is where a molecule that is not a substrate may bind to either enhance or reduce the enzyme activity. Binding of an allosteric regulator changes the shape of the enzyme and influencing its overall activity.