The fundamental difference between the two methods is that molecular cloning involves replication of the DNA in a living microorganism, while PCR replicates DNA in an in vitro solution, free of living cells.
Costs. Becoming a doctor is not cheap. Depending on your location and specialty, medical school alone can cost between $50,000 and $150,000, and thatâs only tuition.
How many years does it takes in medical school and college to become a doctor?   Four years of college and four years of medical school (two in class, then two interning in a hospital. Then you're an MD, but a doctor of nothing. You have to do at leaâ¦st three years of residency, depending on your specialty.