Which structure is involved in genetic engineering?
A
Plastid
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B
Plasmid
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C
Codon
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D
All of these
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Solution
The correct option is B Plasmid Genetic engineering refers to the addition of new genes/DNA to the genetic material of an organism to add one or more new advantageous traits. It makes use of restriction enzymes and vectors to transfer the desired DNA sequence from one organism to another.
Plastid is a double-membrane cell organelle found in plants and algal cells. They serve as the site for the production and storage of important chemical compounds used by the cell. They are not part of genetic engineering. Plasmids are extrachromosomal DNA used as cloning vehicles and can be stably inherited in an extrachromosomal state. A plasmid cloning vehicles share a number of desirable features namely low molecular weight, ability to confer readily selectable phenotypic traits on host cells, single sites for a large number of restriction endonucleases; hence are used as cloning vectors.
Codon is a sequence of DNA nucleotides on the genes that specify a particular amino acid in the encoded protein. Genetic engineering adds a new sequence of codons (genes) to the preexisting one and, hence, are not a tool in it.