BISC 101 Lecture Notes - Lecture 2: Hydrogen Bond, Nitrogenous Base, Purine

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 101
• Professor: Ivona Mladenovic

Document Summary

All the cell"s activities: everything thats written in the dan. Hairless because it is a genetic mutation that has been passed through the generations. 3 parts: phosphate group, sugar (deozyriboes) and nitrogenous base (purine (adenine and guanine), pyrimidines (thymine, cytosine)) Dan is a double polymer of nucleotides. core part= sugar phosphate backbone (sugar alternating with phosphate) Nucleotides contents 3 components: nitrogenous base, pentohead sugar, and phosphate group. Pentohead sugar: 3" and 5" *read in textbook* Nucleoside: has only 2 components (nitrogenous base and phosphate group) Pyrimidines have only one ring. purines have two rings. Cut py: c, u, t are pyrimidines. Pyramidines are the following bases: cytosine, uracil (rna) and thymine. Pyrimidines are single ringed nitrogenous bases and purines are double ringed nitrogenous bases. Adjacent nucleotides are joined vertically by covalent bonds called phosphodiester bonds. Two free ends: 5" end (phosphate attacted to a 5" carbon) 3" end (hydroxyl group on a 3" carbon)