CAS CH 203 Lecture Notes - Lecture 2: Peptide, C-Terminus, Tyrosine
21 Sep 2017
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Cells are (cid:862)(cid:272)o(cid:373)ple(cid:454) little (cid:271)ags(cid:863) of orga(cid:374)i(cid:272) (cid:373)ole(cid:272)ules. The interior cells contain a vast array of organic molecules. Key point: virtually all aspects of cell behavior & function are dictated by how these molecules interact with & regulate each other. Chemical properties of water influence virtually all aspects of cell biology. It is polar; the hydrogen atoms have a slight positive charge and the oxygen has a slight negative charge. Water molecules can form hydrogen bonds with each other or with other polar molecules, and interact with ions. Ions and polar molecules are readily soluble in water (hydrophilic). Nonpolar molecules cannot interact with water and are poorly soluble (hydrophobic). Inorganic ions constitute 1% or less of the cell mass and include: sodium (na+, potassium (k+, magnesium (mg2+, calcium (ca2+, phosphate (hpo4, chloride (cl , bicarbonate (hco3 (cid:1006) ) Organic molecules are the unique constituents of cells. Most belong to one of four classes of molecules:
