- Created by: missmascara
- Created on: 09-03-10 19:57
Nucleic acids- information molecules of cells.
DNA- deoxyribonucleic acid.
RNA- ribonucleic acid
DNA/RNA- polymers monomers are nucleotides/ mononucleotides.
Each mononucleotide- 3 parts- pentose (5 CARBON) sugar, phosphate group and a nitrogen containing base.
Pentose Sug. In RNA- ribose, DNA- deoxyribose- (one less oxygen)
Nitrogen-containing bases found in nucleic acids-
PURINES- 2 Nitrogen rings—ADENINE, GUANINE
PYRIMIDINES- 1 Nitrogen ring- CYTOSINE, THYMINE
DNA- 4 base combo- 1 PURINE TO ONE PYRIMIDINES A-T G-C
RNA purine base same but thymine is replaced by Uracil.
DEOXYRIBOSE has OH, off carbon on bottom left pentagon corner, and H on bottom right, RIBOSE has both OH.
Phosphate group- makes nucleotides= nucleic acids are acidic
Sugar, Base and phosphate joined by CONDENSATION REACTIONS- loss 2 H20 molecules.
Mononucleotides linked by condensation reaction- polynucleotide strands.
Sugar from one bonds to phosphate in another= hydroxyl group at one end and phosphate at other.
RNA- forms singular polynuc. Strands- folded to shapes or remain thread.
DNA- two strands twisted around each other, one upside down.
Inwards= bases = spiralled DNA…