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6 DIFFERENCES BETWEEN DNA AND RNA DNA Contains the sugar deoxyribose RNA Contains the sugar ribose Contains thymine Contains uracil instead of thymine Is a double stranded helix Is a single strand 1 type of DNA 3 types of RNA: m-RNA, t-RNA, r-RNA DNA can’t leave the nucleus mRNA leaves the nucleus DNA is much longer RNA is shorter strands Can replicate itself No replication Types of RNA: 1. mRNA – messenger RNA; takes the “message” from the DNA into the cytoplasm so it can be translated into a polypeptide chain (protein). 2. tRNA – transfer RNA; “transfers” specific amino acids to the ribosome for the construction of the polypeptide chain. 3. rRNA – ribosomal RNA; involved with the production and maintenance of ribosomes.