When an inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme by competing for the active site, the phenomenon is known as competitive inhibition. Which of the following is a classic example of this type of inhibition?

Step-by-step solution

The question describes competitive inhibition, where the inhibitor competes with the substrate for the active site due to structural similarity. According to NCERT, a classic example of competitive inhibition is the inhibition of the enzyme succinic dehydrogenase by malonate. Malonate closely resembles the substrate succinate in its molecular structure. Option 1 is incorrect because cyanide is a non-competitive inhibitor of cytochrome oxidase. Option 2 is incorrect because glucose-6-phosphate causes feedback inhibi