Question

The tumor inducing capacity of Agrobacterium tumefaciens, which is located in large extra - chromosomal plasmids called

• A. III plasmid
• B. Lambda phage
• C. pBR 322
• D. Ti plasmid

Answer 1

The correct option is D Ti plasmid

• Agrobacterium tumefaciens is the agent of crown gall disease (the formation of tumors) in eudicots.
• It is a rod-shaped, gram-negative soil bacterium.
• To be virulent, the bacterium must contain a tumor-inducing plasmid (Ti plasmid or pTi), of 200 kb, which contains the T - DNA and all the genes necessary to transfer it to the plant cell.

So, the correct answer is 'Ti plasmid'