Which of the following in not an example of competitive inhibition?
1. Inhibition of succinic dehydrogenase by malonate
2. Inhibition of bacterial pathogens by sulpha drugs
3. Inhibition of alcohol dehydrogenase by ethanol in case of methanol poisoning
4. Inhibition of hexokinase by glucose-6-phosphate
Refer NCERT, Heading 9.12.4, page-157 and 158, Inhibition of hexokinase by Glucose-6- phosphate is done by Feedback inhibition.