Organic compounds - Nucleic Acids
- Two types of nucleic acids: DNA and RNA
- Both are polymers of nucleotides.
- Nucleotides consisting of nitrogenous bases, phosphate group, pentose (5 C sugar)
- The sequence of the 5 nitrogenous bases, determines unique structure of DNA and RNA.
- Pyrimidines (6 member ring)
Purines (6 member ring + 5 ring)
Deoxyribonucleic Acid (DNA)
- Polynucleotide formed by bonds between sugar and phosphate (sugar-phosphate backbone).
- Nitrogenous base sticks out of the strand.
- DNA exists as two strands wrapped around each other (double helix).
- N-bases connect with another sugar-phosphate backbone strand.
- A pyrimidine always connects to a purine.
- Adenine with thymine (A - T)
- Guanine with cytosine (G - C)
- The sequence of the 5 N-bases, determines unique structure of DNA.
Ribonucleic Acid (RNA)
- Like DNA: polynucleotide with nitrogenous bases sticking out sugar-phosphate backbone strand.
- RNA exists as a single sugar-phosphate backbone strand.
- Also uracil replaces thymine