How has the discovery of antibiotics helped mankind in the field of medicine?

How has the development of bioreactor helped in biotechnology?

Antibiotics are those chemicals which are obtained from the useful micro-organisms and are employed to kill some harmful micro-organisms. But all the antibiotics donot have medicinal importance. Discuss the following: What should be the properties of the antibiotics to be used in medicinces?

How do the various leaf modifications help plants?

Which conditions make an antibiotic to be ideal for medicinal use?

How do antibiotics function ?

How is cotton produced in the fields ?