Question

which structural characteristic is seen in rna but not in dna?
o double strands
a single strand
o chains of nucleotides
a helical shape

Explanation:

DNA is typically double - stranded with a helical shape and is composed of chains of nucleotides. RNA, on the other hand, is usually single - stranded (although it can fold and have some double - stranded regions in its secondary structure). Double strands and helical shape are more characteristic of DNA. Both DNA and RNA are made of chains of nucleotides.

Answer:

a single strand