colourless crystalline compound. Any of several bases that are derivatives of purine; a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances.

To open an essay to set the scene.

likely or prone to be affected by. conditionally upon. An area of study at school, e.g. math, history. cause or force person or thing to undergo.

salt or ester of phosphoric acid. Salt of phosphoric acids.

recognizably different in nature.

To hold something inside something else.

To do, be or happen for the first time; begin.

arrangement of and relations between parts or elements of something complex. To plan, organize, or arrange the parts of something.

way that constitutes or serves as path.

having acquired much knowledge through study. To get knowledge or skills by study or experience.

expressive. what is meant by word, text, etc.. To have a particular intention or value.

assembled or made from whatever is available, and so unlikely to be of highest quality. mark or wound made by scratching. score or mark surface of something with sharp or pointed object.

Any of various compounds consisting of a nucleoside combined with a phosphate group and forming the basic constituent of DNand RNA.

Careful plan or method for achieving a goal. Branch of military dealing with command.

very successful, authoritative, and commanding great respect. To make something clearly different from others.