Which of the statements below best describes how enzyme activity is regulated by genetic control?

• A. The enzyme is regulated by adding or removing groups on the enzyme polypeptide chains.
• B. The production or synthesis of enzymes is controlled by hormones.
• C. A genetic regulator will bind to the allosteric site and can open or close the enzyme’s active site.
• D. The end genetic product acts as a negative regulator of the enzyme in the first step.