Question 1-3 of 7: Transposons (Organization of Genes and Chromosomes) | SWAYAM Cell Biology | Includes PYQs | Get Solutions with Detailed Explanations

Which one of the following statements about Short Interspersed Nuclear Elements (SINEs) is TRUE? (February Shift 2)

Following statements were made while describing the characteristics of transposable elements:

A. Most transposons use a common mechanism in which DNA is nicked to generate blunt ends for its subsequent incorporation.

B. Homologous recombination between the repeats of a transposon may result in precise or imprecise excision.

C. P elements are transposons which show differential splicing pattern in germ line and somatic cells.

D. In a transposon, Cis-acting mutants that may prevent its transposition are generally located near the ends.

E. An insertion sequence (IS) is a transposon, which is always flanked by long (more than 30 bases) direct

(December)

Transposons can be primarily categorized into two types, DNA transposons and retrotransposons. Given below is some information regarding the above

1. Eukaryotic DNA transposons excise themselves from one place in the genome and integrate into another site.

2. Retrotransposons are RNA sequences that are first reverse transcribed into cDNA and then integrate into the genome.

3. Retrotransposons move by a copy and paste mechanism through an RNA intermediate.

4. As DNA transposons move via a cut and paste mechanism, there can never be an increase in the copy number of a transposons.

Which of the statement is true? (June)