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Lecture 4

BIOL 112 Lecture Notes - Lecture 4: Dna, Pentose, Nitrogenous Base


Department
Biology
Course Code
BIOL 112
Professor
Frieder Schoeck
Lecture
4

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BIOL 112 Winter 2013
Schoeck Lecture 4
Large Molecules 2: Nucleic Acids and Lipids
Nucleic Acids
Nucleic Acids are a polymer.
The nucleotides are its monomers.
Their roles include:
o DNA (deoxyribonucleic acids) which has the information to
our genetic makeup
o DNA is transcribed into RNA (ribonucleic acid) which is
translated into proteins
o Nucleotides also signal molecules and energy transducers
Nucleotides
A nucleotide has a nitrogenous base, a pentose sugar, and
phosphate groups.
[Make references to the picture to the right when looking for C#]
Pentose sugar the backbone
Ribose RNA
Deoxyribose DNA
Phosphates connected to C5
The group is normally joined to C5 hydroxyl of the ribose or deoxyribose.
Mono-, di-, and tri-phosphates are common.
Energy-rich bonds releases energy when broken.
Nitrogenous Bases Connected to C1
Pyrimidine (ring only) includes
o Thymine
o Cytosine
o Uracil* only present
in RNA and replaces
Thymine
Purine (ring + penta) includes
o Adenine
o Guanine
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