Nucleosides consist of a nitrogenous base bound by an N-glycosyl linkage to a phosphorylated pentose. true or false
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20. Nucleosides consist of a nitrogenous base bound by an N-glycosyl linkage to a phosphorylated pentose.
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- Given the structures of the ribonucleotides and deoxyribonucleotides: Adenine Uracil Thymine HN Adenine NH HO-P-0- CH2 HO-P-0 CH2 HO-P-0-CH2 HO-P-0-CH он он он он OH H OH H Cytosine Cytosine Guanine Guanine NH2 NH NH2 CH2 HOo CH2 HO-P-0 -CH2 он он он он OH H OH H • Draw the structure of the polyribonucleotide UAGCCUG. Draw the structure of the polydeoxyribonucleotide CGTAGAT.Describe the functions of the following proteins during DNA breaks and repair: (i) Ku70 (ii) Uracil DNA glycosylaseIn pyrimidine nucleosides the anti conformation predominates because of steric interactions with pentose. Do thepurine nucleosides have similar interactions?
- A homopolymer of histidine (polyhistidine) adopts an alpha helix structure at pH 9 but isunfolded at a pH of 4. Explain why using chemical detailsDescribe the steric interactions that determine the conformations that pyrimidine nucleosides assume.The anomer of a-D-glucopyranose is CH:OH он ÓH CH2OH он он он он CH,OH он он он он CH,OH он OH он ÓH ÇH;OH он он он он
- Identify if the statement is correct or incorrect, "Nucleotides consist of a nitrogenous base bound by an N-glycosyl linkage to a phosphorylated pentose."You are presented with Cytidine 5' triphosphate and Thymidine 5' triphosphate. Draw and upload to Efundi these phosphorylated structures as they would be connected in a polinucleotide in the order CpT / Show the individual phosphorylated structures first then show how they combine to form the polynuleotide. Show at any one of these structures where the glycosidic bond occurs(a) Draw the structure of the high-energy nucleoside triphosphate GTP. (b) Draw the structure of the hydrolysis product formed when one phosphate is removed.
- The structures of tRNAs contain several unusual bases in addition to the typical four. Suggest a function for the unusual bases.Which functional group is found in proteins? Carbonyl Phosphate Proteinyl Amino HydroxylDescribe the chemical differences between a ribonucleotide triphosphate and a deoxyribonucleotide monophosphate.
