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.
Terminal degree. A terminal degree is a university degree that is either highest on the academic track or highest on the professional track in a given field of study. For certain professions and research grants it means the lowest degree to be considered qualified.