| List-1 (Enzyme Class) | List-II (Type of reaction catalysis) | ||
| A | Oxidoreductases | I | Cleavage of C-C, C-O, C-N or other bonds by elimination |
| B | Transferases | II | Transfer of electrons (hydride ions or H atoms) |
| C | Lyases | III | Group transfer reaction |
| D | Ligases | IV | Formation of C-C, C-S, C-O and C-N bonds by condensation reaction |
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| List I (Genetic Disorders) | List II (Genetic Alteration) | ||
| A | Down syndrome | I | Gain of X-chromosome |
| B | Klinefelter's syndrome | II | Loss of X-chromosome |
| C | Turner's syndrome | III | Trisomy of chromosome 21 |
| D | Cri du chat syndrome | IV | Deletion of small terminal portion of chromosome 5 |
Choose the correct answer from the options given below: