Read the following statements.
(i) Primers used in PCR are small chemically synthesised oligosaccharides.
(ii) E. coli is closely related to Salmonella.
(iii) There are 3 basic steps in genetically modifying an organism.
(iv) The techniques of the genetic engineering overcome the limitation of traditional hybridisation procedures
In these statements how many are correct?
Read the following statements.
(i) Primers used in PCR are small chemically synthesised oligosaccharides.
(ii) E. coli is closely related to Salmonella.
(iii) There are 3 basic steps in genetically modifying an organism.
(iv) The techniques of the genetic engineering overcome the limitation of traditional hybridisation procedures
In these statements how many are correct?
The correct option is B 3
Escherichia coli
Escherichia coli is closely related to Salmonella and hence the plasmid from the Salmonella can be used to form recombinant DNA and transferred to Escherichia coli for cloning.
Three basic steps in genetically modifying an organism
The three basic steps in genetically modifying an organism are as follows:-
- Identification of DNA with desirable genes.
- Introduction of the identified DNA into the host
- Maintenance of introduced DNA in the host and transfer of the DNA to its progeny.
Traditional hybridisation
Traditional hybridisation procedures like the desired crosses often led to the inclusion and multiplication of undesirable genes along with the desired genes in the progenies. This limitation can be overcome by the techniques of genetic engineering.
Therefore the given statements ii, iii and iv are correct.
Final answer
(b) 3
Escherichia coli
Escherichia coli is closely related to Salmonella and hence the plasmid from the Salmonella can be used to form recombinant DNA and transferred to Escherichia coli for cloning.
Three basic steps in genetically modifying an organism
The three basic steps in genetically modifying an organism are as follows:-
- Identification of DNA with desirable genes.
- Introduction of the identified DNA into the host
- Maintenance of introduced DNA in the host and transfer of the DNA to its progeny.
Traditional hybridisation
Traditional hybridisation procedures like the desired crosses often led to the inclusion and multiplication of undesirable genes along with the desired genes in the progenies. This limitation can be overcome by the techniques of genetic engineering.
Therefore the given statements ii, iii and iv are correct.
Final answer
(b) 3
