In mung bean, resistance to yellow mosaic, virus and powdery mildew were brought about by :
1. Mutation breeding
2. Biofortification
3. Tissue culture
4. Hybridization and selection
Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it
| 1. | is very specific and uses different macrophages, |
| 2. | produces memory cells for mounting fast secondary response. |
| 3. | has natural killer cells which can phagocytose and destroy microbes |
| 4. | provides passive immunity. |
Which of the following diseases is an auto-immune disorder?
1. Myasthenia gravis
2. Arthritis
3. Osteoporosis
4. Gout
Coca alkaloid or cocaine is obtained from
1. Papaver somniferum
2. Atropha belladona
3. Erythroxylum coca
4. Datura
Match the following enzymes with their functions:
|
Column-I |
Column-II |
||
|
(a) |
Restriction endonuclease |
(i) |
joins the DNA fragments |
|
(b) |
Exonuclease |
(ii) |
extends primers on genomic DNA template |
|
(c) |
DNA ligase |
(iii) |
cuts DNA at specific position |
|
(d) |
Tag polymerase |
(iv) |
removes nucleotides from the ends of DNA |
Select the correct option from the following:
1. (a) - (iii), (b)- (i), (c)- (iv), (d)-(ii)
2. (a) - (iii), (b)- (iv), (c)- (i), (d)-(ii)
3. (a) - (iv), (b)- (iii), (c)- (i), (d)-(ii)
4. (a) - (ii), (b)- (iv), (c)- (i), (d)-(iii)
The two antibiotic resistance genes on vector pBR 322 are for:
| 1. | Ampicillin and Tetracycline |
| 2. | Ampicillin and Chloramphenicol |
| 3. | Chloramphenicol and Tetracycline |
| 4. | Tetracycline and Kanamycin |
Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage ?
1. Beadle and Tatum
2. Messelson and Stahl
3. Hershey and Chase
4. Jacob and Monod
A selectable marker is used to :
1. help in eliminating the non-transformants so that the transformants can be regenerated
2. identify the gene for the desired trait in an alien organism
3. select a suitable vector for transformation in a specific crop
4. mark a gene on a chromosome for isolation using restriction enzyme
Given below are four statements pertaining to separation of DNA fragments using Gel electrophoresis. Identify the incorrect statements.
(a) DNA is negatively charged molecule and so it is loaded on gel towards the Anode terminal.
(b) DNA fragments travel along the surface of the gel whose concentration does not affect movement of DNA.
(c) Smaller the size of DNA fragment, larger is the distance it travels through it.
(d) Pure DNA can be visualized directly by exposing to UV radiation.
1. (a), (c) and (d)
2. (a), (b) and (c)
3. (b), (c) and (d)
4. (a), (b) and (d)
An enzyme catalysing the removal of nucleotides from ends of DNA is:
| 1. | DNA ligase | 2. | Endonuclease |
| 3. | Exonuclease | 4. | Protease |
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