Multiple choice

Assertion (A): Transposition starts by forming a strand transfer complex in which the transposon is connected to the target site through one strand at each end. Reason (R): Replicative transposition proceeds through a cointegrate.

Directions: In the following question, there are two statements, Assertion (A) and Reason (R). Consider both the statements independently and mark your answer as follows:

1. A and R both are correct and R is the correct explanation of A.
2. A and R both are correct and R is not the correct explanation of A.
3. A is correct and R is incorrect.
4. A is incorrect and R is correct.
5. A and R both are incorrect.

  1. (1)

  2. (2)

  3. (3)

  4. (4)

  5. (5)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct answer. Transposition starts by forming a strand transfer complex in which the transposon is connected to the target site through one strand at each end. Replicative transposition proceeds through a cointegrate. Replication of a strand transfer complex generates a cointegrate, which is a fusion of the donor and target replicons. The cointegrate has two copies of the transposon, which lie between the original replicons. Recombination between the transposon copies regenerates the original replicons, but the recipient has gained a copy of the transposon.

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