Which of the following best describes the characteristics and function of sirna?
a a short strand of rna that can complement and inactivate a sequence of mrna
b. a short strand of rna that can act as a transcription factor to initiate transcription
c a strand of dna that can bind to and inactivate an mrna sequence
d. a trna that is not able to attach to a ribosome and therefore inhibits the process of translation

A a short strand of RNA that can complement and inactivate a sequence of mRNA

Option A

Explanation:

siRNA stands for small interfering RNA which has a set double-stranded RNA molecule. It is also called as silencing RNA or short interfering RNA. mRNA is a messenger molecule in the siRNA.

siRNA integrates into a protein complex known as RISC that tells the siRNA to target the RNA sequence. Then its double strands unwind into a short strand in that protein complex and remain bound to it.

It then directed by the RISC either to complement ( enhance) the mRNA molecule sequence or to degrade (inactivate) the mRNA molecule sequence.