Multiple choice

With reference to the designing of vectors based on Ti and Ri plasmids, consider the following statements:

  1. They are disarmed by removing the genes causing the disease.

  2. They carry sites for insertion of gene of interest.

  3. They carry selectable markers.

Which of the statements given above are correct?

  1. 1 and 2 only

  2. 2 and 3 only

  3. 1 and 3 only

  4. 1,2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ti (tumor-inducing) and Ri (root-inducing) plasmids are disarmed by removing disease-causing genes while retaining the T-DNA region for gene insertion. They include selectable markers (antibiotic resistance) and cloning sites for genetic engineering. All three statements correctly describe vector design.

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