- 1(current)
Q. No.Manipulation of DNA in genetic engineering became possible due to the discovery of:
1. Restriction endonuclease
2. DNA ligase
3. Transcriptase
4. Primase
Subtopic: Â Restriction Enzymes - Main Enzymes |
 91%
Level 1: 80%+
AIPMT - 2002
Hints
Restriction endonucleases:
| 1. | Are used in genetic engineering for ligating two DNA molecules. |
| 2. | Are used for in vitro DNA synthesis. |
| 3. | Are synthesized by bacteria as part of their defense mechanism. |
| 4. | Are present in mammalian cells for the degradation of DNA when the cell dies. |
Subtopic: Â Restriction Enzymes - Main Enzymes |
 56%
Level 3: 35%-60%
AIPMT - 2004
Hints
Which one of the following hydrolyses internal phosphodiester bonds in a polynucleotide chain:
1. Lipase
2. protease
3. Exonuclease
4. Endonuclease
Subtopic: Â Restriction Enzymes - Main Enzymes |
 78%
Level 2: 60%+
AIPMT - 2005
Hints
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.