Proteus is a weak recipient of R-factor.

Nalidixic acid is a synthetic chemical useful for treatment of urinary tract infections caused by gram negative bacteria. Its antimicrobial activity is attributed to inhibition of DNA synthesis.

Isoniazid acts by blocking pyridoxine and nicotinamide catalyzed reactions. It is a structural analog of pyridoxine and nicotinamide and thus, can block pyridoxine and nicotinamide catalyzed reactions.

Interferons are small glycoprotein substances made and released by host cells in response to the presence of several pathogens, such as viruses, bacteria, parasites and also tumor cells. They are produced by RDT (Recombinant DNA Technology).

Anthramycin is an anti-tumor antibiotic. It works by inhibiting the synthesis of RNA and DNA of carcinoma cells.

Bacterial cells susceptible to penicillin can be protected from destruction if the medium in which they are exposed is of high osmotic pressure. The high osmotic pressure prevents the cells from bursting.

Erythromycin manifests its action by binding to 23S rRNA component of 50S subunit of the ribosome, thereby blocking the tunnel where the polypeptide string is supposed to exist.

Fosfomycin inhibits conversion of UDP-GlcNAc to UDP-MurNAc. This is the first committed step in peptidoglycan biosynthesis, so amenable to selective action.

Lincomycin belongs to lincosamide group of antibiotics. Lincomycin is an antibiotic that fights bacteria.

Quinolones bind to DNA gyrase as a topoisomerase inhibitor, thereby inhibiting synthesis of DNA.

Pyrimethamine is a protozoal DHFR (Dihydrofolate reductase) inhibitor and thus, it is used as an antiprotozoal agent.

Bacitracin is used to distinguish S. pyogenes from other β-hemolytic streptococci because S. pyogenes is sensitive to bacitracin and other beta hemolytic bacteria are resistant.

Monobactams work only against aerobic gram negative bacteria, e.g. Neisseria, Pseudomonas etc.

This is the correct match. Tomaymycin is an anti-tumor, Amatadine is an anti-viral, Griseofulvin is an anti-fungal, Gallidermin is an anti-bacterial.

This is the correct match. Chlorotetracycline is produced by S. aureofaciens, Streptomycin is produced by S. griseus, Nystatin is produced by S. noursei and Vancomycin is produced by S. orientalis.