How can RNA be described as ‘single-stranded’ if it is capable of producing these complicated structures?

If the following nucleotide sequence, CTC/TGT/AAG/ACC/TTT experienced a mutation resulting in the deletion of the second cytosine in the first DNA triplet so the sequence is now CT_/TGT/AAG/ACC/TTT, what would be the amino acid sequence created from this mutated DNA strand? Table of mRNA codons UUA, UUG = leucine AGG, AGA = arginine %3D CAU, CAC = histidine GUU, GÜC, GUA = valine GAA. GAG=glutamic acid GCU, GUA, GUG = alanine GAU, GAC = asparagine GGU, GGC, GGA = glycine UCA, UCU =serine CGU, CGC, CGA = arginine

RNA was extracted from certain virus and found to contain 35% cytosine. With this information, is it possible to predict what percentage of the bases in virus are adenine? If so, what percentage? If not, why not?