RNA

From The School of Biomedical Sciences Wiki
Revision as of 18:53, 16 November 2010 by 090388668 (Talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

RNA stands for ribonucleic acid. RNA is made up of ribose, a five carbon sugar, and phosphate which forms the backbone. Attached to this backbone are 4 bases, in a similar way to DNA where cytosine (C) pairs with guanine (G) and thymine (T) pairs with adenine (A), in RNA C pairs with G, but A pairs with uracil (U) instead of T.[1]


RNA involved in gene expression

1. mRNA – messenger RNA [2]

               - DNA is transcribed into mRNA, therefore the mRNA and the DNA are complementary
               - This mRNA is then used as a template for translation into a functioning protein
               - mRNA is also used to make copy DNA (cDNA)
2. tRNA – transfer RNA[3]
             - consists of a sequence of three bases and an associated amino acid
             - This molecule travels to the ribosome where a polypeptide is formed, the sequence of which was determined by the mRNA.
3. rRNA – ribosomal RNA [4]
             - This is the RNA found in ribosomes
             - It acts as a catalyst for protein synthesis


References

  1. Berg JM, Tymoczko JL and Stryer L, 2007, Biochemistry 6th edition, NY, W. H Freeman and Company, page 109
  2. Berg JM, Tymoczko JL and Stryer L, 2007, Biochemistry 6th edition, NY, W. H Freeman and Company, page 119
  3. Berg JM, Tymoczko JL and Stryer L, 2007, Biochemistry 6th edition, NY, W. H Freeman and Company, page 120
  4. Berg JM, Tymoczko JL and Stryer L, 2007, Biochemistry 6th edition, NY, W. H Freeman and Company, page 120
Personal tools
Namespaces
Variants
Actions
Navigation
Toolbox