AP Biology Lab 1: diffusion and Osmosis  Essay by
cutediva126High School, 10th grade February 2009  download word
file, 1 pages 3.0  Lab 1: Diffusion and OsmosisPurpose:The
purpose of this lab was to understand the mechanisms of
diffusion and osmosis as well as there importance to cells by
using a model membrane system. Another purpose of this lab is to
help describe the effects of water gain and lose in different
cells, specifically animal and plant cells. Also in this lab we
will learn the concept of water potential, molarity and its
relationship to osmotic concentration.  Hypothesis:I believe
that some molecules, like starch, will not diffuse through a
membrane if they are large while small molecules such as glucose
will pass through the membrane easily. Also I hypothesize that
if the sucrose concentration is changed, then mass will also
change. I believe this because the molarity of sucrose
determines the amount of water that moves in to or out of the
bag.  Materials:See attachedProcedure:See attachedData