Somaclonal variations are:
1. | seen in plants that have been produced by plant tissue culture. |
2. | due to environmental factors and have no evolutionary advantage. |
3. | induced by mutations and are inherited. |
4. | not useful in plant breeding programs. |
Consider the two statements:
I: | Use of genetically modified crops can be a possible solution for minimizing the use of chemicals and fertilizers that are detrimental for the environment. |
II: | Genetically modified crops do not require any fertilizers. |
1. | Both I and II are correct and II explains I. |
2. | Both I and II are correct but II does not explain I. |
3. | I is correct but II is incorrect. |
4. | Both I and II are incorrect. |
Why does the bacterium Bacillus thuringiensis not affected by the toxins produced by it that can kill arthropods?
1. | The toxin inactivated by proteins in the bacterial cells. |
2. | The bacterial cell does not have organelles and thus it is harmless. |
3. | It is produced as a pro-toxin by the bacterium. |
4. | The protein needs post-transcriptional modification possible only in eukaryotic cells. |
Identify the incorrect statement regarding the use of RNAi for creating transgenic tobacco plants resistant to Meloidogyne incognita:
1. | Agrobacterium tumefaciens was used to transform the plant cells |
2. | Double-stranded RNA was introduced into the plant cells |
3. | Double-stranded RNA was formed in the plant cells that initiated RNAi |
4. | A specific mRNA of the nematode was silenced with the help of dsRNA |
Gene therapy for ADA deficiency has been tried with the help of which of the following vectors?
1. | Microinjection | 2. | Liposome |
3. | A bacterium | 4. | A retrovirus |
Alpha-1-antitrypsin was produced in a transgenic sheep, Tracy. This enzyme is used in the treatment of:
1. | Emphysema | 2. | Rheumatoid arthritis |
3. | Ovarian cancer | 4. | Pancreatitis |
The most important advantage of micropropagation is:
1. | production of virus free plants |
2. | rapid production of a large number of genetically identical superior plants |
3. | creation of somaclonal variations for effective germplasm collection |
4. | production of transgenic plants |
GM crops have been modified with various traits. Golden rice has been developed by the International Rice Research Institute for:
1. | Improved shelf life | 2. | Disease resistance |
3. | Herbicide resistance | 4. | Improved nutritional value |
Transgenic animals used to test the safety of polio vaccine are:
1. | Mice | 2. | Monkeys |
3. | Rabbits | 4. | Pigs |
A possible permanent cure for SCID can be:
1. | Enzyme replacement therapy, in which functional ADA is given to the patient by injections. |
2. | Bone marrow transplantation. |
3. | A functional ADA cDNA (using a retroviral vector) introduced into lymphocytes. |
4. | Gene isolated from marrow cells producing ADA is introduced into cells at early embryonic stages. |