| NUCLEIC | ____ acid, a complex organic substance present in living cells (7) |
| ALKALOID | Any of a class of complex organic bases of vegetable origin, e.g. morphine, strychnine, nicotine (8) |
| ECOSPHERE | Copes badly, present in living environment (9) |
| TUNICIN | Animal cellulose; a substance present in the mantle, or tunic, of the Tunicates (7) |
| THIAMIN | Is yours truly coming in skinny? Organic substance needed (7) |
| VITAMIN | Organic substance found in most foods (7) |
| COMPOST | Mixture of various decaying organic substances, used for fertilizing soil. (7) |
| ENZYMES | Protein substances produced by living cells (7) |
| PROTEIN | Consisting of amino acid polymers, an essential constituent of living cells |
| OSMOSIS | How living cells get water (7) |
| ENZYME | Substance created in living cells acting as a catalyst |
| TRACEELEMENT | Essential bodily substance present in small amounts (5,7) |
| GENETICCODE | Information held in living cells (7,4) |
| PROTEINS | Complex substances present in all living organisms that have great nutritional value (8) |
| FORMIC | _ _ _ _ _ _ acid, a colourless, irritant volatile compound contained in a fluid emitted by ants (6) |
| LIPIDS | Fatty organic compounds in living cells |
| PECTIN | From the Greek for "congealed", a substance present in citruses, crab-apples, currants, gooseberries, quinces, plums, unripe blackberries and other fruits, traditionally used for setting jams and jell |
| MALIC | Substance present in unripe apples, mountain ash berries, etc. (5,4) |
| ACID | Substance present in unripe apples, mountain ash berries, etc. (5,4) |
| CHROMOSOME | Thread-like structure in living cells carrying genetic information (10) |
