While RNA Is Often Single Stranded, Transfer RNA (TRNA)is Usually

Multiple Choice

While RNA is often single stranded, transfer RNA (tRNA) is usually found with some double stranded structure. Which of the following explains this?

A) tRNAs contain self-complimentary stem-loop structures
B) after synthesis, tRNA molecules are hydrolyzed in specific places to allow double stranded structures to form
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