A Researcher Introduces Double-Stranded RNA into a Culture of Mammalian

question 10

Multiple Choice

A researcher introduces double-stranded RNA into a culture of mammalian cells, and can identify its location or that of its smaller subsections experimentally, using a fluorescent probe.
-Within the first quarter hour, the researcher sees that the intact RNA is found in the cells. After 3 hours, she is not surprised to find that

• A) Dicer enzyme has reduced it to smaller double-stranded pieces.
• B) the RNA is degraded by 5' and 3' exonucleases.
• C) the double-stranded RNA replicates itself.
• D) the double-stranded RNA binds to mRNAs to prevent translation.
• E) the double-stranded RNA binds to tRNAs to prevent translation.