Question

28. In mammals and other animals, the expression of a specific gene can be turned off by the introduction of

a)short dsDNA

b)short dsRN

c)short ssDNA

D)long ssDNA

long dsDNA

Answer 1

Ans:- b). short dsRNA

explanation:- short dsRNA is short double stranded RNA. inhibition of gene expression by dsRNA is also call RNA interference. in mammals this processes initiate by enzyme called dicer which cleave long strand of dsRNA into short dsRNA. this dsRNA unwound and become passenger strand and guide strand. guide strand then bind to RISC (RNA induced silencing complex) and turn off gene expression. other option are not correct as they have DNA which is not part of RNA interference. therefore short dsRNA is correct answer.