Identify a character that is not desirable in a cloning vector:
1. an inactive promoter
2. an origin of replication site
3. selectable markers such as genes for antibiotic resistance
4. one or more unique restriction endonuclease sites
The DNA molecule to which the gene of interest is integrated for cloning is called:
1. | Transformer | 2. | Vector |
3. | Template | 4. | Carrier |
Which vector can clone only a small fragment of DNA?
1. Bacterial artificial chromosome
2. Yeast artificial chromosome
3. Plasmid
4. Cosmid
Which one of the following is a case of wrong matching ?
1. Somatic hybridisation - Fusion of two diverse cells
2. Vector DNA - Site for tRNA synthesis
3. Micropropogation - In vitro production of plants in large numbers
4. Callus - Unorganised mass of cells produced in tissue culture
Which of these are most widely used in genetic engineering?
1. Plastid
2. Plasmid
3. Mitochondrion
4. Ribosome
Plasmid vector in DNA recombinant technology means
1. a virus that transfers gene to bacteria
2. extra-chromosomal autonomously replicating circular DNA
3. sticky end of DNA
4. any fragment of DNA carrying desirable gene
Which of the following statement is not true:
(1) Transformation is a procedure through which a piece of DNA is introduced in a host bacterium
(2) Normally, the genes encoding resistance to antibiotics are considered useful selectable markers for E.coli
(3) The normal E.coli cells do not carry resistance against antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin
(4) Presence of one recognition sites within the vector will generate several fragments, which will complicate the gene cloning
To be useful in genetic engineering a vector must have
A gene has been inserted into a vector for the purpose of cloning the sequence only. This vector is called
a. Suppression vector
b. Expression vector
c. Cloning vector
d. None of these
Recombinant DNA is formed in nature during-
(1) Crossing over at pachytene
(2) Integration of plasmid to form episome
(3) Integration of phage DNA to form prophage
(4) More than one is correct.