UPSC CDS I 2019 English Paper

The Nobel Prize for Chemistry this year is a tribute to the power of ___(101)____ The laureates harnessed evolution and used it in the ___(102)____ with amazing results. Frances H. Arnold, an American who was given one-half of the prize, used ‘directed evolution’ to ___(103)___ variants of naturally occurring enzymes that could be used to ___(104)___ biofuelsand pharmaceuticals. The other half went to George P. Smith,also of the U.S., and Sir Gregory P. Winter, from the U.K., whoevolved antibodies to ___(105)____ autoimmune diseases and even metastatic cancer through a process called phage display.