BIOL 1201 Lecture : Bio Notes
Document Summary
W at e r: 70%-90% of weight of most life forms, sets the lower temperature limit for life, water is a biological molecule. H+: the difference between ph 3 and ph 5 is a 100-fold difference in the concentration of. H+: ph of 7 is neutral, ph below 7 is acidic, ph above 7 is basic. poh = log [1/oh-] = -log [oh-] poh. Substances that maintain a constant ph: solute, solute, what determines the solubility, like dissolves like, like in terms of polarity, polar solutes dissolve in polar solvents and vice-versa, hydrophilic substances interact with water molecules. Biological molecules: except for water, all are built on a carbon skeleton, large molecules constructed from smaller molecules, polymers constructed from monomers, water, carbohydrates, lipids, proteins, nucleic acids. Functional groups: hydroxyl alcohols, carbonyl aldehydes (terminal carbon) and ketones, carboxyl acid group, amino amines, sulfhydryl thiols, phosphate organic phosphates, methyl ch3 (nonpolar) Carbon skeleton: backbone, covalently linked in carbon molecules.
