Bio Semester 1 study Guide
Subject:
Biology [1]
Tags:
#biology [2]
Cell Theory All living organisms are composed of one or more cells Cells are the basic units of structure and function in an organism Cells come only from the reproduction of existing cells Cell Shapes Each cell has a shape that has evolved to allow the cell to perform its function effectively Cell Surface Area-To- Volume Ration The size of a cell is limited by the relationship of the cell?s outer surface area to its volume. As a cell grows, volume increases much faster than its surface area does. Cell Membrane- Selectively Permeability The cell membrane allows only certain molecules to enter or leave the cell. Prokaryotes vs. Eukaryotes Prokaryotes are organisms that lack a membrane- bound nucleus and membrane bound organelles.