MCB 2210 Lecture Notes - Lecture 1: Cubic Function, Cell Nucleus, Cytoskeleton
31 Aug 2016
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Bonds (covalent vs. non-covalent; ionic, hydrogen) ph. The central dogma: dna makes rna makes protein. Enzymes carry out chemical reactions needed for life. Cell size & shape: most eukaryotic cells are 10-30 m in diameter, but vary greatly in shape. Small molecules move into and out of cells by diffusion through the products diffuse out of the cell. As a spherical cell gets larger, its cytoplasmic volume increases as a cubic function. The amount of transport is limited by the amount of surface area. This is a limit to the size of metabolically active cells. Growth is often coupled with division to maintain cells at a manageable size. Diffusion: the spread of particles through random motion: water molecules are in constant motion: they bump into each other and other molecules in solution causing random movement - brownian motion (i. e. , there is no directionality).
