18902.The enzyme that cuts the bonds of DNA molecule at the origin of replication is
Endonuclease
DNA polymerase
DNA gyrase
DNA ligase
18905.Restriction endonucleases are enzymes which
Recognize a specific nucleotide sequence for binding of DNA ligase
Make cuts at specific positions within the DNA molecule
Remove nucleotides from the ends of the DNA molecule
Restrict the action of the enzyme DNA polymerase
18906.Introduction of foreign genes for improving genotype is
Tissue culture
Immunisation
Biotechnology
Genetic engineering
18907.It is now possible to breed plants and animals with desired characters through
Genetic engineering
Chromosome engineering
Ikebana technique
Bonsia technique
18910.Nonsense codon takes part in
Terminating message of gene controlled protein synthesis
Formation of unspecified amino acids
Conversion of sense DNA into non-sense one
Releasing tRNA from polypeptide chain
18913.Which one of the following is a case of wrong matching?
Micropropagation-In vitro production of plants in large numbers
Callus - Unorganized mass of cells produced in tissue culture
Somatic hybridization - Fusion of two diverse cells
Vector DNA - Site for t-RNA synthesis
18914.Plants developed in vitro culture from pollen grains are
Androgenic plants
Pollen plants
Male plants
Sterile plants
18915.Hirudin is obtained from the transgenic plant
Brassica napus
Hibiscus rosasinesis
Raphanus sativus
Vinca rosea
18916.Plasmids are vectors for gene cloning because they
Self replicate in bacterial cells
Replicate freely outside bacterial cells
Can be multiplied in culture
Can be multiplied in laboratories using enzymes
18917.Which organism was used as bioweapon derived from______.
Clostridium
Yerstsinia pestis
Fusarium species
Green algae
18919.Preserving germplasm in frozen state is
Cryopreservation
Cold storage
In situ preservation
Vernalisation
18920.Restriction endonuclease is employed for cutting
A single stranded DNA
Double stranded DNA
RNA fragment
mRNA
18921.Restriction endonucleases are
Used in genetic engineering for uniting two DNA molecules
Used for in vitro DNA synthesis
Present in mammalian cells for degeneration of DNA of dead cells
Synthesised by bacteria for their defence
18922.Restriction enzymes are used in genetic engineering because they
Can join DNA fragment
Cut DNA at specific base sequence
Cut DNA at variable sites
Are proteolytic enzymes which degrade harmful proteins
18923.Reverse transcriptase is
RNA dependent RNA polymerase
DNA dependent RNA polymerase
DNA dependent DNA polymerase
RNA dependent DNA polymerase
18925.In cloning of cattle a fertilized egg is taken out of the mother's womb and
in the eight cell stage the individual cells are separated under electrical field for further development in culture media
the egg is divided into 4 pairs of cells which are implanted into the womb of other cows
in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
from this up to eight identical twins can be produced