List the signs of similarities and differences in the structure of DNA and RNA molecules.

Nucleotides are polymers, components of both DNA and RNA, and this will be their similarity. DNA is deoxyribonucleic acid, consists of two chains complementary to each other and contains thymine, adenine, guanine and cytosine, 90% of the DNA is in the nucleus. RNA is ribonucleic acid and consists of one strand. It contains adenine, cytosine, guanine and uracil. There is transport RNA (tRNA); ribosomal RNA (rRNA); messenger RNA (mRNA), contained in the cytoplasm and nucleolus.