BIOL130 Lecture Notes - Lecture 2: Nucleoside Triphosphate, Cell Nucleus, Pyrimidine
29 Nov 2018
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Document Summary
Proteins has 20 aa"s available, and dna has 4. Does not have a hydroxyl group on 2" carbon. They can act as signalling molecules within the cell. Some proteins act as enzymes, biological catalysts, needs helper molecules known as co-enzymes of which are derived from individual nucleotides, Sugar phosphate backbone is anti parallel, builds from 5"->3" Deoxy ribo nucleotides forms standard anti parallel double helix. The two strands held together by h-bonds, the phosphate backbone has no role in holding the two strands together, only the individual nitrogenous bases holding it together. Only when a purine and pyrimidine pair fits in the helix. Nitrogenous bases are hydropphobic therefore inside the phosphate backbone solubility. Mechanism of control as the genes are not always accessible. When comparing dna to mran, dna wants to be stable, since it holds all the genetic information, we don"t want it to be graded very fast. dna can be found from millions of years ago.
