[MCAT Question of the Day, Click Display Images To See] + Join us on Facebook<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=09fbf2012d&e=61d7ba7392> + Connect on Twitter<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=ba428599e7&e=61d7ba7392> Inhibition by Penicillin Penicillin exerts its effect on bacterial growth through inhibition of cell-wall synthesis. This antibiotic blocks the last step in the formation of the cell wall. Glycopeptide transpeptidase is a bacterial enzyme that catalyzes the cross-linking reaction between peptidoglycan molecules, which are the main constituents of the cell wall. Penicillin inhibits the enzyme by binding covalently to its active site. The penicillin-enzyme complex cannot react further. This is an example of: A. irreversible inhibition. B. competitive inhibition. C. noncompetitive inhibition. D. uncompetitive inhibition. To see the solution, visit the following link: http://mcatquestionoftheday.com/biology/inhibition-of-penicillin/<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=68c6ec897a&e=61d7ba7392>
