APG 201 Lecture Notes - Cytosine, Adenine, Guanine
Document Summary
Why is variation so important to darwin"s theory of evolution by natural selection: natural selection runs off of what variations are there, no variations = no natural selection. The cell: basic unit of life, similarities dues to shared ancestry. 2 types: prokaryote and eukaryote, smallest metabolically functional unit of life. Origins of life: earth- 4. 6 billion years old. Life- 3. 7 billion years old: miller urey experiment, mix of water, methane, ammonia, and hydrogen, shocked with electricity. Formed sugar and amino acids (building blocks of protein, all life is protein) 1. 2 billion years old: multi cellular organisms, organelles, dna is contained in nucleus. Two types of eukaryotic cells: somatic (body, gametes (sex cells, ova, sperm. Dna: deoxyribonucleic acid, double stranded molecule, contains genetic code, composed of nucleotides, shape of double helix. Structure of dna: nucleotide, sugar (deoxyribose, phosphate, nitrogenous base. Dna discovered by roslyn franklin: stolen by watson and crick.
