n RNA sequence that can form a secondary structure must have pairing between bases. The sequence in option A has sections that can fold and pair up, and is thus an example of a sequence that will produce a secondary structure in an RNA molecule.
Step-by-step explanation:
The student's question pertains to the identification of a sequence in an RNA molecule that will produce a secondary structure. RNA molecules fold into secondary structures based on base pairing.
The correct option for a sequence that will form a secondary structure is one where bases are complementary and can pair up, forming stems and loops.
In RNA, Adenine (A) pairs with Uracil (U), while Guanine (G) pairs with Cytosine (C). Therefore, the sequence in option A) CGCGCAAAGCGCG can form a secondary structure because there are complementary sections within the sequence that can pair up (e.g., CGCGC...GCGCG).