13. While RNA is often single stranded, transfer RNA (tRNA) is usually found with some double stranded structure. Which of the following explains this?
(A) After synthesis, tRNA molecules are hydrolyzed in specific places to allow double stranded structures to form.
(B) tRNAs contain self-complimentary stem-loop structures.
(C) Regions of tRNAs become supercoiled, thus forcing formation of double stranded regions.
(D) tRNAs adopt a form much like Z-DNA allowing double stranded regions to form.
(E) None of the above. Which of the following, when paired with its complementary strand, would have the highest Tm? AAGTTCCAGT