Assignment:
The article you review should come from PUBMED.
You should discuss what directed evolution is, what it is used for , different types of mutagenic techniques ( chemical mutagenesis) , PCR (recombinant PCR, Error Prone PCR), different types of selections (metabolic selections), X- gal. Discuss when the added enzyme works (only during flash pasterization) due to its temperature range.
For better understanding, I am researching how can people who are lactose intolerant still enjoy dairy products.