5 sulfhydryl groups consist of sulfur atom bonded to

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5) Sulfhydryl Groups- consist of sulfur atom bonded to hydrogen atom -sulfhydryl groups on different molecules can link via disulfide (S-S) bonds Chapter 4: Nucleic Acids and RNA World Nucleotides, monomers that make up nucleic acids -Three components are 1) Phosphate Group (bonded to sugar) 2) A Sugar (bonded to nitrogenous base) 3) Nitrogenous base RNA-has sugar ribose and has OH- group bonded to the 2’ carbon DNA- has sugar deoxyribose and has just an H bonded to the 2’ carbon Polymerization -process is endergonic -nucleotide monomers first raised by reactions that add two phosphate groups to ribonucleotides/deoxyribonucleotides creating nucleoside triphosphates - addition of one or more phosphate groups raises the potential energy of a substrate molecule enough to make an otherwise endergonic reaction possible DNA Structure - Polymerizes through phosphodiester linkages - Number of purines=number of pyrimidines - Number of C’s and G’s are equal and the number of T’s and A’s are equal - Has a regular and repeating structure - Two strands of DNA run antiparallel to one another -these strands are twisted together to form double helix -purine-pyrimidine pairs form - allows for hydrogen bonds to form between Adenine and Thymine, and hydrogen bonds between Guanine and Cytosine -A-T and G-C bases are complimentary DNA Functions -stores and transmits biological info -stability key to info bearing molecule - cannot self-replicate instead is copied RNA Structure
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-has backbone consisting of sugar phosphates formed by phosphodiester linkages like in DNA -the pyrimidine base thymine does not exist -instead has pyrimidine base uracil -complimentary base pairs = A-U and G-C -double stranded stem and single stranded loop form a hairpin secondary structure -formation of hairpins=exergonic -more diverse in size and shape an reactivity than DNA RNA Function -catalyzes chemical reactions -is self-replicating -info containing molecule -thought to be first life form
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  • Fall '11
  • Coffman
  • Biology, DNA, Evolution, new chemical bonds, complex carbon, carbon containing compounds, Carbon Chemical Evolution-leading

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