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 celly by entering it.
IV . Erythromycin is an example of bacteriostatic antibiotic

Options

A. I, II
B. II, III
C. I, IV
D. III, IV

Answer

C

Explanation

(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 teh 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 answer.