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.
From Wikipedia, the free encyclopedia. A graduate school (or grad school) is a school that gives advanced academic degrees, such as master's degrees (M.S. or MBA ...) and doctoral degrees (Ph.D. or L.L.D. or D.D.S. etc.). A graduate student (or grad student) is a student who goes to the school. Also, in British English, the phrase postgraduate student is more common.