Nucleic acids {ribonucleic acid}| (RNA) can have ribonuceotides. Hydroxyl groups at pentose-sugar second carbons make RNA chains unable to lie anti-parallel to each other for more than several bases, so RNA cannot make double helices. RNA can double back on itself to make hairpin loops, with short double strand at neck.
types
Ribose-nucleotide nucleic acid is for protein translation (mRNA), codon translation (tRNA), protein-synthesis sites (rRNA), and intron excision from RNA (snRNA). Specific 22-nucleotide fragments of RNA have regulatory activity.
genes
E. coli has 50 to 200 RNA genes, as do other organisms. Over 95 percent of eukaryotic RNA encodes rRNA, mRNA, and tRNA, not proteins.
Physical Sciences>Chemistry>Biochemistry>Nucleic Acid>RNA
5-Chemistry-Biochemistry-Nucleic Acid-RNA
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Date Modified: 2022.0224