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Chapter

ch-4 Nucleic Acids and RNA.pdf

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Department
Biology
Course
BIOLOGY 1A03
Professor
Lovaye Kajiura
Semester
Winter

Description
Chapter 4 Nucleic Acids and RNARNA 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 variationnatural selectionthis marked the end of chemical evolution and the beginning of biological evolution Nucleic acidpolymers just like proteins monomersnucleotidescontain 1 phosphate group attached to 5 carbon2 a sugar 3 nitrogenous base sugarcompounds with a carbonyl group cO and several hydroxides in deoxyribose 2 carbon lacks O compared to ribose sugar in DNAin deoxyribose nucleotides thymine instead of uracil uracilRNApryrimidines cannot be naturally made as of yet but purines A G can bePolymerization nucleotides polymerize to form nucleic acids phosphodiester linkage phosphate group of one nucleotide reacts with hydroxyl for sugar 3C hydroxyl of ribose is attached to 5 of other phosphate5 unlinked carbon while the other end has 3 unlinked carbon always written 53 bases are always added to 3 polymerization endothermic catalyzed by enzymesthe addition of a phosphate gro
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