Which one of the following is commonly used in transfer of foreign DNA into crop plants?
1. Trichoderma harzianum
2. Meloidogyne incognita
3. Agrobacterium tumefaciens
4. Penicillium expansum
Polyethylene glycol method is used for
1. gene transfer without a vector
2. biodiesel production
3. seedless fruit production
4. energy production from sewage
Gel electrophoresis is used for
1. cutting of DNA into fragments
2. separation of DNA fragments according to their size
3. construction of recombinant DNA by joining with cloning vectors
4. isolation of DNA molecule
The linking of antibiotic resistance gene with the plasmid vector became possible with
1. DNA ligase
2. endonucleases
3. DNA polymerase
4. exonucleases
Microbes found to be very useful in genetic engineering are:
1. Escherichia coli and Agrobacterium tumefaciens
2. Vibrio cholerae and a tailed bacteriophage
3. Diplococcus sp. and Pseudomonas sp.
4. Crown gall bacterium and Caenorhabditis elegans
Restriction endonuclease :
1. cuts the DNA molecule-randomly
2. cuts the DNA molecule at specific sites
3. restricts the synthesis of DNA inside the nucleus,
4. synthesizes DNA
Which of these are most widely used in genetic engineering?
1. Plastid
2. Plasmid
3. Mitochondrion
4. Ribosome
Introduction of foreign genes for improving genotype is
1. biotechnology
2. vernalization
3. tissue culture
4. genetic engineering
Restriction enzymes:
1. are endonucleases which cleave DNA at specific sites
2. make DNA complementary to an existing DNA or RNA
3. cut or join DNA fragments
4. are required in vectorless direct gene transfer
A tumor inducing plasmid widely used in the production of transgenic plants is that of
1. Escherichia coli
2. Bacillus thuringiensis
3. Staphylococcus aureus
4. Agrobacterium tumefaciens.