ASTR 5 Lecture Notes - Lecture 5: Inverse-Square Law, Body Plan, Sputnik 1
Document Summary
The 4 metabolic classifications are quite general, but we use it to search for cells. Liquid water allows organic chemicals to float inside cells and the transport of chemicals and waste in and out of cells. Molecules necessary for reactions that store and release energy in atp. All living cells on earth need liquid water. Rare errors in copying dna leads to evolutionary adaptations / natural selection on the molecular level. Component molecules: phosphate groups, sugar deoxyribose, and bases adenine (a), thymine (t), guanine (g), and cytosine (c) Nucleotides: phosphate + sugar + 1 base = nucleotide. A always pairs to t, g always pairs to c. Double helix: sugars link with phosphate in next nucleotide, forming the ladder. Seperate a double helix and enzymes (polymerase) copy complementary bases . Errors can occur, but polymerase will correct mistakes as they copy. They change one of the bases next time replication happens.
