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.
The country needs to train 3,000 to 10,000 more physicians a year â up from the current 25,000 â to meet the growing medical needs of an aging, wealthy nation, the studies say. Because it takes 10 years to train a doctor, the nation will have a shortage of 85,000 to 200,000 doctors in 2020 unless action is taken soon.emographic changes in the medical profession also contribute to the need for more physicians. Nearly half of new physicians are women, and studies show they work an average of 25% fewer hours than male physicians, Cooper says. Physicians older than 55 work about 15% less than younger doctors.