Nucleic Acids
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23 Terms
dna and rna of composed of repeating
nucletide units
what are the three coponents of nucelotides
phosphates
base
sugar
nucleoside
base+ sugar only
nucelotide
base, sugar, and a phosphate
What are the two types of nucelobases
purine and pyrimidines
bases are composed of planar, aromatic rings with
pi electrons, important for base stacking
bases are
hydrophobic and insoluble in water
purine are
2 rings, 9 consituent atoms
the purines are
adenine and guanine
pyrimidines
1 ring, 6 consituent atoms
the pyrimidines are
cytosine, thymine, uracil
Tautomers
isomers that are different structures because of the positions of double bonds and hydrogens
adenosine
guanosine
cytidine
thymidine
nucleoides are quite soluble due to their
polar OH group that are part of their structure
polynucelotides are assembled through
phosphodiester bonds between adjacent nucleoside units
in polynucleotides the phosphate will
connect 3’ O of one nucleoside and the 5’ of the next nuceloside
sequences will always be writen in
5’ to 3’ direction
nucelotides are linked with a 3’ to 5’
phosphodiester bond
In a polynucleotides, each phosphate has a pka value of
2 so it will have a -1 charge at ph 7.
what is the structure of atp
