Which of the following statements are correct? I. Binding of inhibitor at allosteric site changes the shape of the active site. II. Shape of the receptor does not change after attachment of chemical messenger to it. III. A chemical messenger gives message to the cell by entering it. IV. Erythromycin is an example of bacteriostatic antibiotic.

Step-by-step solution

(i) Binding of inhibitor at allosteric site changes the shape of the active site in such a way that substrate cannot recognise it. (ii) Shape of the receptor changes after attachment of chemical messenger to it. (iii) A chemical messenger gives message to the cell without entering the cell. (iv) Erythromycin is an bacteriostatic antibiotic used for the treatment of a number of bacterial infections. This includes respiratory tract infections, skin infection, chlamydia infections etc. Hence, option (c) is the correct