BIOL1006 Lecture Notes - Lecture 5: Phosphodiester Bond, Pentose, Polynucleotide

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9 Aug 2016
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Lecture 5
Deoxyribose is similar in structure to ribose, but it has an
H instead of an OH at the 2′ position.
Bases can be divided into two categories: purines and
pyrimidines.
Purines have a double ring structure, and pyrimidines
have a single ring.
The nitrogenous bases are organic molecules and are so
named because they contain carbon and nitrogen.
They are bases because they contain an amino group
that has the potential of binding an extra hydrogen, and
thus, decreasing the hydrogen ion concentration in its
environment, making it more basic.
Each nucleotide in DNA contains one of four possible
nitrogenous bases: adenine, guanine cytosine, and
thymine.
The primary structure of a purine consists of two carbon-
nitrogen rings.
Cytosine, thymine, and uracil are classified as
pyrimidines which have a single carbon-nitrogen ring as
their primary structure.
Each of these basic carbon-nitrogen rings has different
functional groups attached to it.
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