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.

bring into use or operation for first time.

likely or prone to be affected by. conditionally upon. Citizen of an area or country. cause or force person or thing to undergo.

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

Clearly different in nature from something else.

have or hold within.

To turn something on.

arrangement of and relations between parts or elements of something complex. construct or arrange according to plan.

A path or way that you can walk.

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

expressive. Idea or thing represented by words or sentences. To intend to do something in particular.

assembled or made from whatever is available, and so unlikely to be of highest quality. mark or wound made by scratching. To make a small cut or mark on a surface.

compound consisting of nucleoside linked to phosphate group.

plan of action or policy designed to achieve major or overall aim. Branch of military dealing with command.

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