Question

question #9
cell differentiation is the result of gene expression. genes can be regulated several ways. for example, small interference rna molecules (sirna), prevent gene expression by binding to the product of transcription. how do sirna molecules silence genes?
a they bind to ribosomes.
b they bind to trna.
c they bind to rna polymerase.
d they bind to mrna.

Explanation:

Small interfering RNA (siRNA) functions in post-transcriptional gene silencing. It binds to complementary sequences on target mRNA molecules, which leads to the degradation of the mRNA or blocks its translation, thus preventing the gene from being expressed. Ribosomes are involved in translation, tRNA carries amino acids for translation, and RNA polymerase is involved in transcription initiation, none of which are the binding targets of siRNA for gene silencing.

Answer:

D. They bind to mRNA.