|  
 
|  |  |   
| 5 | programmed cell death |   
| 6 | loosely wound DNA present during interphase |   
| 7 | symmetry seen in animals that have both right and left sides |   
| 8 | a group of homeobox genes only present in animals |   
| 12 | when a section of one chromosome breaks off and joins another |   
| 13 | a group of genes that are under the control of the same regulatory mechanism |   
| 14 | when a section of chromosome breaks off, is reversed, and then joins back |   
| 16 | the preferred respiratory substrate for E.coli |   
|  |  |  
 
|  |  |   
| 1 | enzymes that catalyse the addition of phosphate groups to proteins |   
| 2 | a change in the sequence of bases |   
| 3 | a chemical, physical or biological agent that causes a mutation |   
| 4 | a group of genes which all contain a homeobox |   
| 9 | the appearance of an organsism |   
| 10 | symmetry seen in animals like jellyfish |   
| 11 | mutation leading to the incorporation of an incorrect amino acid |   
| 15 | a mutation leading to an early stop codon |   
|  |  |