20) Which of the following sequences is correct? A) DNA - mRNA- tRNA - protein
B) DNA-mRNA - rRNA - protein
C) DNA - ribosome - mRNA - protein
D) DNA - tRNA - mRNA - protein
E) none of the above

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids