ch.4 Nucleic acids & RNA world

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  1. Nucleic Acid
    • -polymers
    • -come as RNA and DNA
    • -RNA and DNA are made up of monomers known as nucleotides
    • -ribonucleotides and deoxyribonucleotides
  2. Structure of nucleotide
    • -5 carbon sugar
    • -phosphate group
    • -nitrogenous base
  3. Nitrogenous bases found in DNA
    • -Adenine(A),
    • -Guanine(G),
    • -Thymine(T) and
    • -Cytosine(C).
  4. RNA
    Instead of Thymine it contains Uracil (U)
  5. 5' end to 3' end
    OH group on the 3rd carbon of the sugar joins the phosphate group on the 5th carbon of the sugar to form the phosphodiester bond.
  6. DNA Structure
    • -double helix
    • -sugar phosphate backbone
    • -complementary base pairing (Watson Crick base pairing) : A-T and C-G
    • -strands parallel to each other but run opposite (anti-parallel)
  7. DNA Function
    • -carries heriditary info in all living cells
    • -The stability of DNA double helix, and accuracy of copying it make it the ideal molecule to carry hereditary information.
    • -One DNA strand of the double helix is copied on to a messenger RNA molecule for protein synthesis. This is how the stored hereditary information in DNA is converted to function.
  8. RNA Structure
    • -single stranded
    • -pairing: A-U, G-C
  9. RNA Function
    can carry information, and it also has the catalytic ability. Catalytic RNA molecules are known as ribozymes. The ability of RNA to carry genetic information as well as its ability to function as a catalytic molecule make is the ideal candidate molecule that formed the first living thing.
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ch.4 Nucleic acids & RNA world
2011-05-04 09:55:13

final exam
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