BIOLOGY 1A03 Chapter Notes -Deoxyribose, Ribose, Polymerization

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Lovaye Kajiura

Document Summary

Rna world hypothesis- majority of biologist contend that life began as polymers nucleic acid: due to the fact that rna can make copies of itself, chance errors in replication would create variation natural selection ! This marked the end of chemical evolution and the beginning of biological evolution ! Polymers, just like proteins. monomers = nucleotides ! Contain 1) phosphate group, attached to 5" carbon! Rna and dna have nitrogenous bases that extend from the backbone! Secondary structure is formed by hydrogen bonding btwn nitrogenous bases! * chargaffs rule- number of purines = number of pyrimidines* t=a, g=c! Strands are anti parallel, one strand 5" --> 3" other would be 3" to 5" ! Coil so that the nitrogenous bases are on the inside (in phosphodiester linkage nitrogen on inside) and sugar phosphate on outside ! 2 hydrogen bonds btwn at, and 3 btwn gc !