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Agrobacterium tumefaciens, a pathogen of several dicot plants, delivers a piece of DNA to transform normal plant cells into a tumor. The genetic element in this bacterium that carries the tumor-inducing principle is naturally :

Options

  1. AA segment of the main bacterial genomic DNA
  2. BAn extrachromosomal linear double-stranded DNA
  3. CAn autonomously replicating, extrachromosomal circular double-stranded DNA
  4. DA single-stranded autonomously replicating RNA molecule

Correct answer

C. An autonomously replicating, extrachromosomal circular double-stranded DNA

Step-by-step solution

Agrobacterium tumefaciens delivers a piece of DNA known as 'T-DNA' to transform normal plant cells into a tumor. This tumor-inducing (Ti) principle is carried on the Ti plasmid. Plasmids are naturally occurring, autonomously replicating, extrachromosomal circular double-stranded DNA molecules found in bacteria. They are distinct from the main bacterial genomic DNA and are not linear or single-stranded RNA. Therefore, the genetic element carrying the tumor-inducing principle is an autonomously replicating, extrachro

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