molecular genetics

molecular genetics - Lecture notes 9/14/09 Molecular...

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Molecular Genetics The cell basic unit of life Prokaryotic cells : single celled organisms no nucleus appeared 3.7 bya Eukaryotic cells have a nucleus appeared 1.2 bya Human body has 1,000 billion cells Structure of Eukaryotic cells cell membrane organelles ribosomes-manufacture proteins mitochondria-generate cell’s energy Nucleus 2 types of cells somatic -body tissues gametes -sex cells ovum (egg) sperm zygote -union between a sperm and an ovum DNA-genetic code DNA provides: codes for biological structures the means to translate this code information for building, operating and repairing organisms DNA structure DNA: 2 nucleotide strands arranged in a double helix and held by chemical bases Nucleotide: Sugar molecule (deoxyribose), phosphate unit and base. 4 DNA bases Adenine (A) Thymine (T) Cytosine (C) Guanine (G) A only binds with T C only binds with G RNA (ribonucleic acid)-RNA differs from DNA in 3 important ways
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molecular genetics - Lecture notes 9/14/09 Molecular...

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