Your cells contain two types of nucleic acids, ribonucleic acid and deoxyribonucleic acid, or RNA and DNA, respectively. They differ from the other macronutrients in that they are not a source of calories in your diet, and their role is strictly to direct the synthesis of new protein molecules.
The definition of a postgraduate is a student who is studying a subject beyond the college level when he already has a college degree. Someone attending medical school is an example of a postgraduate.
What is a Postgraduate Diploma? Postgraduate diploma programs are offered to students who have already earned a bachelor's degree. They are rare in the United States, with most programs offered by institutions in other foreign countries, like the United Kingdom, that are internationally recognized.