| 1. | peptidoglycan | 2. | cellulose |
| 3. | hemicelluloses | 4. | chitin |
| 1. | Metameric segmentation |
| 2. | Parapodia |
| 3. | Jointed appendages |
| 4. | Chitinous exoskeleton |
Asthma may be attributed to?
1. allergic reaction of the mast cells in the lungs
2. inflammation of the trachea
3. accumulation of fluid in the lungs
4. bacterial infection of the lungs
| I: | Haemophilia is a sex-linked recessive disease. |
| II: | Down’s syndrome is due to aneuploidy. |
| III: | Phenylketonuria is an autosomal recessive gene disorder. |
| IV: | Sickle cell anaemia is an X-linked recessive gene disorder |
| 1. | phosphodiester bonds | 2. | covalent bonds |
| 3. | disulphide bridges | 4. | hydrogen bonds |