Assertion (A): | When a particular restriction enzyme cuts strands of DNA, overhanging stretches or sticky ends are formed. |
Reason (R): | Some restriction enzymes cut the strand of DNA a little away from the centre of palindromic site. |
1. | Both (A) and (R) are true and (R) correctly explains (A). |
2. | Both (A) and (R) are true and (R) does not correctly explain (A). |
3. | (A) is true, (R) is false. |
4. | (A) is false, (R) is true. |
List I | List II | ||
(a) | Gene gun | (i) | Replacement of a faulty gene by a normal healthy gene |
(b) | Gene therapy | (ii) | Used for transfer of gene |
(c) | Gene cloning | (iii) | Total DNA in the cells of an organism |
(d) | Genome | (iv) | To obtain identical copies of a particular DNA molecule |
(a) | (b) | (c) | (d) | |
1. | (ii) | (i) | (iv) | (iii) |
2. | (i) | (iii) | (ii) | (iv) |
3. | (iv) | (i) | (iii) | (ii) |
4. | (ii) | (iii) | (iv) | (i) |
(a) | Agarose is a natural polymer obtained from sea-weed. |
(b) | The separation of DNA molecules in agarose-gel electrophoresis depends on the size of DNA. |
(c) | The DNA migrates from negatively-charged electrode to the positively-charged electrode. |
(d) | The DNA migrates from positively-charged electrode to the negatively-charged electrode. |
1. | (a) and (b) only | 2. | (a), (b) and (c) only |
3. | (a), (b) and (d) only | 4. | (b), (c) and (d) only |