The __________ refers to two single-stranded regions on opposite strands connecting two adjacent base-paired segments.
A. hairpin loop
B. interior loop
C. pseudoknot loop
D. helical junctions
Answer:B
The __________ refers to two single-stranded regions on opposite strands connecting two adjacent base-paired segments.
A. hairpin loop B. interior loop C. pseudoknot loop D. helical junctions
Explanation: In addition to the traditional secondary structural elements, base pairing between loops of different secondary structural elements can result in a higher level of structures such as pseudoknots, kissing hairpins, and hairpin–bulge contact. A pseudoknot loop refers to base pairing formed between loop residues within a hairpin loop and residues outside the hairpin loop.