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 begin the use of a new thing or practice.

likely or prone to be affected by. conditionally upon. An area of study at school, e.g. math, history. To cause to suffer or experience something.

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

Clearly different in nature from something else.

To keep something from spreading.

To turn something on.

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

A path or way that you can walk.

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

expressive. what is meant by word, text, etc.. To express a particular idea or thought.

assembled or made from whatever is available, and so unlikely to be of highest quality. mark or wound made by scratching. To rub your skin with your nails to stop an itch.

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.